Finally my engine time!

[M5pilot]

I have experienced those monster brakes.

Worth every single penny in my opinion.

What size are they Ian?

[ian332isport]

Is this the main reason u switched to 17's? I assume u were using smaller rims before the 3.2

No, I had the 17" rims and big brakes when I had the 2.7. I was sort of planning the 3.2 at the time, so I guess this did have something to do with it. Before the 17's I was running some 16" 5 spokes (Compomotive AT's) with 300m discs and standard calipers. Great kit, but the discs kept warping.

Ant has told me he has gone through 3 gearbox bushes the big one right up next to the gearbox with 6 holes in it!

I'm lucky that the 6 speed box uses a much more chunky version of this bush (guibo ?). It's the same size as the E34 M5, and similar to the E30 M3.

I'm in 2 minds now, as i love the idea of both

Go on - you know it makes sense

[M5pilot]

Kermit13 - 3.0 5 speed with massive brakes gets my vote!

[ian332isport]

What size are they Ian?

Sal,

The discs are 322mm in diameter, and a whopping 32mm thick

Ian.

[Ant]

For the record the guibo issue was more mapping related than anything else, I had an issue where yu shut off the gas, then went back on, ie car pulled out on M/way, you'd get a shunt through the driveline as the fuel came back on, all sorted now, had this guibo 6 weeks or so now, looks fine, no shunting is a result too, really spoilt the drive, the power is soo sublime and smooth, its almost like a turbine

Turbo it Simon,. I need the work

[Karan]

turbo it

yes i do abuse mine and thise failures were more due to the high mileage and lack of manitenace i gave the prop causing cibrations which related in a sump bolt falling loose in the bellhousing and getting stuck in the starter gear and cocking the gearbox casing-cracks all over it

e30 drivetrain is solid i think and loads nutters run high power turbo on these....2.7 power will not worry it in everyday fast road use.... however if u take liberties and have littlemechanical sympathy then its not such a good idea with any car

although i managed to snap the driveshaft to diff bolts yday i dunno how i think its cos ive used the same old ones for 3 diff changes..... first time car has left me stranded! Jonb is coming over with tools to help me sort it this afternoon

simon do the build and if its not enuff then turbo it!

the character of the 2.7 is unique though for sure, power delivery is special and makes a very good point to point weapon.

ive heard of charged and blown 2.6/7s amd the figures are very very special

[dlatch33]

Turbo it Simon,. I need the work

lol

simon
i think the drive train will be fine but that prop doughnut issue could be resolved with a custom one piece prop perhaps?

that guy with the cossie engined tourer is still running on standard LSD rear diff with no probs, obviously its all down to the abuse it gets as that will increase the wear rate ect.
Not sure how long it would last doing full power launches at santapod on slicks but hey how often will u be doing that?
Big brakes are a must with extra performance its something mnay people overlook

Karan
your a animal lol

cheers
duncan

[bigkev]

who let that ford in here

[bigkev]

brakes only slow you down so why bother

[Simon13]

hmmm I'll build the engine then run it in bla bla, save up and let Ant do some majic me thinks. This could take a while but i'm sure the end result would be worth it!

Tax runs out on the sport end of the month and i'm tempted to take her out of everyday use and get my SE going! Just need to MOT it.

For once in my life i might really go for it! U guys are bad for the wallet lol

[Splondike]

Nice one Si, at least you might be able to drift a turbocharged 2.7 monster

[Ant]

Had your old ride here last week Mark, still tidy mate and straight through the MOT again this year

Simon, if you wanna go turbo do not fit a cam in that soon to be 2.7..... it will need to come out again for a low duration jobby.

[Simon13]

ok, i still ned to get my head beefed up and welded etc? so my 8.5:1 standard pistons too?

Alpina pistons anyone?

Ant is this blower any good?

http://www.e30zone.co.uk/modules.php?na ... ic&t=22525

[Splondike]

Had your old ride here last week Mark, still tidy mate and straight through the MOT again this year

Yeah I heard, he is looking after her for sure...

Hope you are getting on alright mate, I did try to ring you and left a message - I gather you have moved work locations (but not far lol)

You still up for a lunchtime cuppa sometime ?

[Turbo-Brown]

ok, i still ned to get my head beefed up and welded etc? so my 8.5:1 standard pistons too?

Alpina pistons anyone?

Ant is this blower any good?

http://www.e30zone.co.uk/modules.php?na ... ic&t=22525

Don't think that'd be big enough TBH, bear in mind I've got two T25s (albeit slightly smaller than the Nissan one) for just a 2.5 engine.

[Adam318i]

Go for the 200sx S14 Turbo, Garrett T28, there slightly bigger and newer to.

[Simon13]

So next question is. I'm going to use my 2.5 block. With alpina crank and rods. With my low comp 2.5 pistons. Now is that block going to need a decking?!

Or is it one of those build it up dry and see exercises?

I only ask as i'm not sure how alpina did it. Were their pistons smaller? Or the rods. hmmmm seems a bit unknown territory here!

[will325is]

Not u aswell! very tempting would be a crazy chariot. plus no one seems to have done it......because of the lack of forged cranks i wonder?!

The cast crank takes 600 BHP no need for forged one. Detonation kills the standard engine below this, lowered compression and good tuning is all that is needed not forged crank.

Catcams are decent alternative to shrick cams.

Small turbo will cause high backpressure = detonation.

That T25 is a torque bomb and will kill drive worse then bigger one.

[Jhonno]

Not u aswell! very tempting would be a crazy chariot. plus no one seems to have done it......because of the lack of forged cranks i wonder?!

The cast crank takes 600 BHP no need for forged one. Detonation kills the standard engine below this, lowered compression and good tuning is all that is needed not forged crank.

Catcams are decent alternative to shrick cams.

Small turbo will cause high backpressure = detonation.

That T25 is a torque bomb and will kill drive worse then bigger one.

he's got a forged crank anyways so why not use it?!

[glenn]

i think the drivetrain will handle the extra power.
what output are you expecting simon?

[will325is]

Not u aswell! very tempting would be a crazy chariot. plus no one seems to have done it......because of the lack of forged cranks i wonder?!

The cast crank takes 600 BHP no need for forged one. Detonation kills the standard engine below this, lowered compression and good tuning is all that is needed not forged crank.

Catcams are decent alternative to shrick cams.

Small turbo will cause high backpressure = detonation.

That T25 is a torque bomb and will kill drive worse then bigger one.

he's got a forged crank anyways so why not use it?!

Well i said that because I think he said none seem to have turboed because of lack of forged cranks. Just saying that isnt true because that robins M20B25 engine which i have video of in my sig is putting out near 600bhp on cast crank, just using milled low CR pistons.., but using forged crank is good if you got one anyway.

You might want to build engine with M50 rods simon if you want extra strength, rods are part of bottom engine ive seen break when turboing, ticco broke one at about 400bhp and 2.5bar boost but im told it was only because he used the stock cam which can only flow about 1.5 bar and also had intake leak.

[Simon13]

power out put is something i need to think about, U guys are all saying turbo. But my right hand man Demlotcrew thinks tasty manifold and N/A high comp beast is the way to go! Would be easier for me.

Anyway. At least with the forged one it would break at whatever bhp.
I have non standard alpina 2.7 rods. What makes them different i don't know. Lighter i think.

Will325is why has no really bothered with a 2.7 turbo? the torque difference between the N/A is enormous! I assume this would be the case with a blower too?

[Dan318-is]

i think you should blower it if you can

no lag at all, nicer less chavvy sound, and how many blowered 2.7s are there

youd be the hero of heroes

[Jhonno]

tbh i am personally a fan of n/a so would go the cam, headwork etc route myself

[Ant]

Cost comparisons kill the N/A motor in Ԛ£Ã”šÃ‚£ per pony Simon.

Get your ass to Lakeside M8, I'll talk you outa it, either that or Fozzy will

[Simon13]

k more thinking. If i turbo that would be the same as having a 4.0 engine. Holy smokes

With a 2.7 the torque would be mental. Would it not be too much surely? I mean if the boost was too high it would be un drivable.

At a guess what sort of bhp/lbs would be made at something sensible like 8psi?

The thought of spinning wheels in 2nd/3rd gear in the dry is hilarious but it would take the fun out of out driving it somewhat. Plus my driving would need to improve rapido to cope with it's antics!

Could i have an "M" button Ant for traffic light duels so it ups the boost?!
For everyday u would want something like 250bhp max?!

[M5pilot]

power out put is something i need to think about, U guys are all saying turbo. But my right hand man Demlotcrew thinks tasty manifold and N/A high comp beast is the way to go! Would be easier for me.

Anyway. At least with the forged one it would break at whatever bhp.
I have non standard alpina 2.7 rods. What makes them different i don't know. Lighter i think.

Will325is why has no really bothered with a 2.7 turbo? the torque difference between the N/A is enormous! I assume this would be the case with a blower too?

You'll probably achieve same power/torque as that silver Alpina going the NA route. I went in a 2.5 turbo on at Aces after going for a ride in the Alpina and all I can say is that the turbo felt more fun to drive, much much faster and revved like hell. The torque was simply fantastic. It was very surprisingly almost a linear power delivery too!
That car wasnt even running MS!

[will325is]

power out put is something i need to think about, U guys are all saying turbo. But my right hand man Demlotcrew thinks tasty manifold and N/A high comp beast is the way to go! Would be easier for me.

Anyway. At least with the forged one it would break at whatever bhp.
I have non standard alpina 2.7 rods. What makes them different i don't know. Lighter i think.

Will325is why has no really bothered with a 2.7 turbo? the torque difference between the N/A is enormous! I assume this would be the case with a blower too?

People have done it im sure, is some SA using a US M50 M3 crank and turboing, i think most people dont for reason ant says, more power per Ԛ£ turboing and dont have money to do both most of the time.

You will be best off using a EBC to control boost in car, can set it to what you like then. Belive it helps with lag aswell.

[Simon13]

heres some pics of the crank and high comp alpenis pistons!

[M5pilot]

2.7 turbo!!

Dont listen to Andrew, he just doesnt want your car to be quicker.

[Turbo-Brown]

What's the difference between Alpina pistons and the standard ones?

[Simon13]

this is what i know*

they are special jobbies from Mahle and are smaller, lighter, and have a comp ratio of something over 10:1!

[Simon13]

been busy with this lately!

Crank - been polished didn't need a re grind, and a new key is being machined further up the shaft for the new woodruff key. Will be balanced too

Rods - Cleaned up and going in for balancing

Pistons - Again Cleaned up and sent off for balancing

Am i right in thinking Alpina 2.7's never used vernier pulleys? So if i build this bottom end with the block out if my 2.5 it should be fine and no decking required? I hope so! Will make life a bit easier.

Once this is all done i can start with measuring up for shells

I'm not going to really build it till after the ring trip in May as i want to take my sport, but theres alot of other things i can do, and a few other bolt on bits i still need and advice.

Just an idea me and Demlot were talking about, was going for a slightly milder cam for not such a bottom end loss and individual Dbilias throttle bodies for the top end whack? What do folks think?

[Karan]

use a 284 272 cam man! u know it makes sense

[jaistanley]

Have you considered using bike throttle bodies?

I think suzuki GSX-r 1000 throttles are 43 or 44mm.. Some are. You could make/have made a stubby manifold for them to clamp to. You could even use the std injectors for low rpm/tootling around and the gsx injectors coming in later.

Would give a very stable idle that you could fit lairy cams with. At least the 287/287 or higher. Coupled with the 10.1 compression ratio and a triple cut valve seat your dynamic compression ratio would be vastly improved.

It would require careful mapping though to smoothe the torque curve and phase injectors. Perhaps M50 injectors would be a cheap 6 injector alternative.

All of this said, the N/A engine would be easier to build but that thump in the back you get from a well built turbo lump is awesome!

Jai