Help On Turbos for 2.7

[--alpina--]

i need some advice, i have a 2.7 engine and want to fit a turbo but dont want to change the pistons, what turbo (small) can i fit on the car without bottom block mod, basically fit a small turbo on it and obviously not worrying about blowing head gaskets... fit - plug and play



Jimi

[blingsta]

maybe 1 from a t/d. ? why dont you go for a decompression plate instead mate?

[carpmart]

The size of the turbo is all about how quick or slow it spools up and how much it flows. You can run low boost with large and small turbo's as it is all about how you control the boost!

[Ant]

The size of the turbo is all about how quick or slow it spools up and how much it flows

not quite true dude, the huge Holset on Fozzymonsters car spools to the same target boost @ the same rpms as my old T3, its 3x the size in all respects

TD turbo is dead money so avoid,same to be said for the mainfolds, not worth the grief as they have no upwards potential when you crave more boostage

if your 2.7 is a high comp(10:1 upwards) you will need to drop the CR down to the 8:1 area to have any form of reliability, easy to turbo anything, not so easy if you want it to last.

sell the 2.7 mill ? bolt in a stock late B25 and turbo that

[blingsta]

The legend speaks....

[carpmart]

The size of the turbo is all about how quick or slow it spools up and how much it flows

not quite true dude, the huge Holset on Fozzymonsters car spools to the same target boost @ the same rpms as my old T3, its 3x the size in all respects

Interesting!

Ant, please tell me more about these Holset blowers? Any flow comparisons to T3 and T25's etc? Are they decent quality? Where from and How much?

Thanks

[WillG]

holsets are great quality, very strong, cheap, and they have a much more efficent design then the old garrets, the thing with small turbos that spool earlier is when you get boost very low down in rpm you will get alot more cylinder pressure, say you have a small garret which gives you 8 psi at 2500 rpm and then a bigger turbo which gives 8 psi at 3500 rpm the smaller turbo is more dangerous becuase it gives you alot more cylinder pressure, it also gives alot more backpressure which will restict you at high rpm. So when people think they are being safe fitting a small turbo at low boost and try to get away with piggyback ECU's and RRFPR's they are actually taking alot more risks then fitting a larger turbo. If you watch videos of some cars with pretty big turbos the responce isnt that bad, there are some cars with huge turbos like HX50's which come off 15+ litre diesel engines and the response sucks but once you have boost and your going through gears it wont lag. It just means instead of putting your foot down alot of the time you will need to drop it down a gear, if you watch ticcos video he has a large turbo like HX40 size and he doesnt get that much lag atall and he is running 7:1 compression so his NA power is down abit. Alot is to do with you manifold, tuning and wastegate control, say you have a 8 psi spring in a wastegate and nothing else keeping it shut then it will start to leak before then and this will slow down you spool.

My HX40 in my avatar would cost you about £550 new, I got a deal on mine cos I exchanged some parts off a much bigger/expensive turbo with them. You can get them new and used on ebay and not all holsets are really big they come in all sizes going down close to the size of the cossie garrets and upto turbos for 20 litre+ engines but the difference is the compressors are small in comparison to the turbines on holsets when comparing with garret petrol turbos i think.

A holset that would suit most people would be a HX35 or H1C with one of the smaller turbine housings.

[carpmart]

holsets are great quality, very strong, cheap, and they have a much more efficent design then the old garrets, the thing with small turbos that spool earlier is when you get boost very low down in rpm you will get alot more cylinder pressure, say you have a small garret which gives you 8 psi at 2500 rpm and then a bigger turbo which gives 8 psi at 3500 rpm the smaller turbo is more dangerous becuase it gives you alot more cylinder pressure, it also gives alot more backpressure which will restict you at high rpm. So when people think they are being safe fitting a small turbo at low boost and try to get away with piggyback ECU's and RRFPR's they are actually taking alot more risks then fitting a larger turbo. If you watch videos of some cars with pretty big turbos the responce isnt that bad, there are some cars with huge turbos like HX50's which come off 15+ litre diesel engines and the response sucks but once you have boost and your going through gears it wont lag. It just means instead of putting your foot down alot of the time you will need to drop it down a gear, if you watch ticcos video he has a large turbo like HX40 size and he doesnt get that much lag atall and he is running 7:1 compression so his NA power is down abit. Alot is to do with you manifold, tuning and wastegate control, say you have a 8 psi spring in a wastegate and nothing else keeping it shut then it will start to leak before then and this will slow down you spool.

My HX40 in my avatar would cost you about £550 new, I got a deal on mine cos I exchanged some parts off a much bigger/expensive turbo with them. You can get them new and used on ebay and not all holsets are really big they come in all sizes going down close to the size of the cossie garrets and upto turbos for 20 litre+ engines but the difference is the compressors are small in comparison to the turbines on holsets when comparing with garret petrol turbos i think.

I am actually not a expert on turbos but neither am I a novice with a couple of conversions under my belt! I found your post interesting!

I use a turbosport valve which holds boost pressure from the actuator until the boost you have dialed in has been reached and therfore stops wastegate creep and dramatically improves the spool up.

[e30_Turbo]

holsets are great quality, very strong, cheap, and they have a much more efficent design then the old garrets, the thing with small turbos that spool earlier is when you get boost very low down in rpm you will get alot more cylinder pressure, say you have a small garret which gives you 8 psi at 2500 rpm and then a bigger turbo which gives 8 psi at 3500 rpm the smaller turbo is more dangerous becuase it gives you alot more cylinder pressure, it also gives alot more backpressure which will restict you at high rpm. So when people think they are being safe fitting a small turbo at low boost and try to get away with piggyback ECU's and RRFPR's they are actually taking alot more risks then fitting a larger turbo. If you watch videos of some cars with pretty big turbos the responce isnt that bad, there are some cars with huge turbos like HX50's which come off 15+ litre diesel engines and the response sucks but once you have boost and your going through gears it wont lag. It just means instead of putting your foot down alot of the time you will need to drop it down a gear, if you watch ticcos video he has a large turbo like HX40 size and he doesnt get that much lag atall and he is running 7:1 compression so his NA power is down abit. Alot is to do with you manifold, tuning and wastegate control, say you have a 8 psi spring in a wastegate and nothing else keeping it shut then it will start to leak before then and this will slow down you spool.

My HX40 in my avatar would cost you about £550 new, I got a deal on mine cos I exchanged some parts off a much bigger/expensive turbo with them. You can get them new and used on ebay and not all holsets are really big they come in all sizes going down close to the size of the cossie garrets and upto turbos for 20 litre+ engines but the difference is the compressors are small in comparison to the turbines on holsets when comparing with garret petrol turbos i think.

I am actually not a expert on turbos but neither am I a novice with a couple of conversions under my belt! I found your post interesting!

I use a turbosport valve which holds boost pressure from the actuator until the boost you have dialed in has been reached and therfore stops wastegate creep and dramatically improves the spool up.

Bleed valves are cool although ECU controlled boost via a solonoid is the way to go...

Mines set up to give 4 levels of boost at different TPS/RPM levels.

So at WOT and over 4k I'm getting 21psi and at 50% tps @ 4k I get 12psi.

Can't bloody wait to test it out now, just weather and money holding me back!!

[E30BeemerLad]

Lol Mark, I bet you can change a headgasket in double quick time now

[e30_Turbo]

Lol Mark, I bet you can change a headgasket in double quick time now

35mins, start to finish

Although thats without removing both manifolds which would add a good hour on top if I did. I found that I was just man enough to lift the head with manifolds attached and line the head up in one go, that saves so much time. Also having a friend too attach the rear water pipe at the back of the head helps too.

I just hope I don't have to do another on mine for a while now, wanna get a few thousand miles on it before I push past 21psi and enter another round of destruction testing......why I'm the test bitch I don't know but atleast I get to brush up on my spanner skills quite regular

[carpmart]

holsets are great quality, very strong, cheap, and they have a much more efficent design then the old garrets, the thing with small turbos that spool earlier is when you get boost very low down in rpm you will get alot more cylinder pressure, say you have a small garret which gives you 8 psi at 2500 rpm and then a bigger turbo which gives 8 psi at 3500 rpm the smaller turbo is more dangerous becuase it gives you alot more cylinder pressure, it also gives alot more backpressure which will restict you at high rpm. So when people think they are being safe fitting a small turbo at low boost and try to get away with piggyback ECU's and RRFPR's they are actually taking alot more risks then fitting a larger turbo. If you watch videos of some cars with pretty big turbos the responce isnt that bad, there are some cars with huge turbos like HX50's which come off 15+ litre diesel engines and the response sucks but once you have boost and your going through gears it wont lag. It just means instead of putting your foot down alot of the time you will need to drop it down a gear, if you watch ticcos video he has a large turbo like HX40 size and he doesnt get that much lag atall and he is running 7:1 compression so his NA power is down abit. Alot is to do with you manifold, tuning and wastegate control, say you have a 8 psi spring in a wastegate and nothing else keeping it shut then it will start to leak before then and this will slow down you spool.

My HX40 in my avatar would cost you about £550 new, I got a deal on mine cos I exchanged some parts off a much bigger/expensive turbo with them. You can get them new and used on ebay and not all holsets are really big they come in all sizes going down close to the size of the cossie garrets and upto turbos for 20 litre+ engines but the difference is the compressors are small in comparison to the turbines on holsets when comparing with garret petrol turbos i think.

I am actually not a expert on turbos but neither am I a novice with a couple of conversions under my belt! I found your post interesting!

I use a turbosport valve which holds boost pressure from the actuator until the boost you have dialed in has been reached and therfore stops wastegate creep and dramatically improves the spool up.

Bleed valves are cool although ECU controlled boost via a solonoid is the way to go...

Mines set up to give 4 levels of boost at different TPS/RPM levels.

So at WOT and over 4k I'm getting 21psi and at 50% tps @ 4k I get 12psi.

Can't bloody wait to test it out now, just weather and money holding me back!!

The turbosmart valve is not a bleed valve as it holds the pressure upto the dialed in boost before releasing to the actuator. Bleed valves do not solve wastegate creep, this does!

[--alpina--]

Thanks guys for your input, and will contemplate on the turbo and ill ask the master Ant if he wants to take on a job in converting... also, what kind of price would it be to go down the turbo route?? as i currently have a 6 branch manifold also, would the manifold need to be modified??


Cheers!!!


Jimi

[WillG]

you will probly have to sell the manifold and sort out a turbo manifold, it might be possible to convert it but you will have to start right back close too the flange so there wont be much of it leaft and it will probly save time and money just selling it

[blingsta]

you will need a new turbo manifold mate, sell 6 branch...

[--alpina--]

Hi thanks for replies, this turbo manifold what would it be like?, something like the manifold from the E30 324td? cos there is one i can get...



Jimi

[Ant]

Always up for another conversion, gimme a yell if you're serious dude

Fozzys manifold was once a Hartge 6 branch with a rotten lower collector, I chopped it up and remade with new 6 into 1 collector but upside down, works rather well, even if its a bit frankenstein on the outside

[WillG]

wouldnt use that TD manifold myself but you oculd do , this is an ok manifold for reasonable price

http://itgperformance.com/equal-length- ... dedf4c103c

and you might be able to get it cheaper elsewhere, I think gcorky is using one. It depends on what power your looking for and if you care what it looks like, there are 2 better manifolds then that one that I know of but they are quite alot more expensive. The cheapest option will be to use TD manifold or flip and modify your 6 branch or std manifold