2.7 Potential performance

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Foomanchu
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Sun Dec 10, 2006 3:24 pm

I have just finnished running my car in as it has just had a 2.7 upgrade and I can now start to open her up a little bit and she is almost certainly quicker but what sort of increase in performance can I expect...???

Thanks

Lui
maxfield
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Sun Dec 10, 2006 3:25 pm

what are the specs i.e cam has it got bbtb 6 branch etc
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Foomanchu
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Sun Dec 10, 2006 3:31 pm

It is as Standard as can be except a full Fritzs system I'm waiting for a zone chip then in the New Year a schrick cam and flowed head might be on the agenda and if required a custom remap....

It really doesn't feel that far of the pace of our M3 although not as savage in it's delievery
maxfield
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Sun Dec 10, 2006 3:36 pm

A decent spec 2.7 will keep up with an M3 due to the torque of it.
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dazleeds
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Sun Dec 10, 2006 3:39 pm

will be greatly improved with the right chip remap and cam winkeye
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Foomanchu
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Sun Dec 10, 2006 3:46 pm

Well I'm looking forward to that then... because it is now far quicker and it really keeps going but suddenly the brakes feel as if there lacking I might get some better pads...

What were the offical figures of the Alpina c2.7 or the Hartge h27
and will they be similar to our type of 2.7 ?

Lui
dazleeds
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Sun Dec 10, 2006 3:51 pm

not sure on them figures fella but remember the 2.7s all about the torque :twisted:

also depends which way you built it

325 head or 320i head etc

what chip are you using now ? standard 325?

im doing mine soon with 325 head 273 cam some head work and eta bottom end full remap
hoping for some decent figures

copying a friends engine which pulls like a train :D
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oguz327
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Sun Dec 10, 2006 4:04 pm

Should be interesting Daz, got a very similar build to yours which is at the bottom end phase atm.

A good 2.7 build should be 200bhp min with the right chip and manifold.

How long till your 2.7 goes in Daz?
Foomanchu
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Sun Dec 10, 2006 4:08 pm

It's a 325 head and the eta bottom end pretty straight forward by all accounts, it has been chipped as a 2.5 about 2 years ago it runs fine all be it on Shell V-power just awaiting the 2.7 zone chip...

but it does just pull and then keep going well...
It wheel spinned away from the lights earlier as an auto it didn't do that before.

:D
dazleeds
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Sun Dec 10, 2006 4:09 pm

oguz3001 wrote:Should be interesting Daz, got a very similar build to yours which is at the bottom end phase atm.

A good 2.7 build should be 200bhp min with the right chip and manifold.

How long till your 2.7 goes in Daz?
not sure tbh mate

not started yet but have most of the bits ready now

but have some spending to do elsewhere so may be a few months before its done, not much point me having just yet anyway with the bad weather on its
way ill prob find me self in a field starring back at the road :twisted:

ps hoping for a nice bit over 200 brake winkeye

and will MS at a later date
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oguz327
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Sun Dec 10, 2006 4:20 pm

Santa pod should be fun!

Sir i challenge you to a dual winkeye
dazleeds
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Sun Dec 10, 2006 4:20 pm

oguz3001 wrote:Santa pod should be fun!

Sir i challenge you to a dual winkeye
challenged accepted :twisted:
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oguz327
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Sun Dec 10, 2006 4:21 pm

Haha, wicked :twisted:
dazleeds
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Sun Dec 10, 2006 4:22 pm

oguz3001 wrote:Haha, wicked :twisted:
should see some real tech 1 domination this time :D
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oguz327
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Sun Dec 10, 2006 4:22 pm

Whats the spec on yours gonna be then Daz?

Is it secret :o
dazleeds
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Sun Dec 10, 2006 4:29 pm

not secret mate :twisted:

msn if ya fancy a chat before we get told off lol
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Simon13
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Sun Dec 10, 2006 4:44 pm

your spec at the moment sounds basic and should be around the 190 mark on bhp and torque, i expect it's still alot nicer to hoon around in than a 2.5 though

Alpina lumps were 210bhp and 213lbs, hartge's were slightly less, A C2 2.7 will out run any M3 apart from the Evo2's and 3's of the world in a straight line. Most M3's push out around 170lbs high up the rev range and lack the get up and go of a sorted 2.7

If u want that 2.7 to go then it's all about the cam and head work it needs to breath! Standard 2.5 cam is very lame and is for economy and reliablitly. A remap is a must, if u can find someone who can map motronic. Or it's standalone with alpha N, emerald, megasquirt. In theory u could break the 215bhp mark with the right spec and correct mapping. If u could get the fueling redone it would help it alot as it is.
Foomanchu
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Sun Dec 10, 2006 6:49 pm

Ok then so once the other work is done it's going to move on the performance again, wow I really hope so...


Lui
MONSPORT42
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Sun Dec 10, 2006 8:41 pm

Quote: but it does just pull and then keep going well...
It wheel spinned away from the lights earlier as an auto it didn't do that before.

Another 2.7 auto! Mine was built by Bexleys a few years back now and has been modded more along the way. Mine's the one in the Bigger Throttle Body FAQ. Had a lot of head work done and also did a MAF conversion with ITG. (stand alones won't work with autos, Bexleys tried an MBE but it wouldn't change gear). Mapping is the key to releasing the full power though. Also watch which cam you choose - remember you need a smoothish idle for 'creep' otherwise you'll be stalling everywhere - a Schrick 272 is probably about the max.
I think the high torque of the 2.7 mates really well with the Sport autobox - makes a fantastic conversion.
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Foomanchu
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Sun Dec 10, 2006 9:49 pm

I remember a e30 rolling road test in Total Bmw a while back and there was an Auto 2.7 that gave the best power on the day 222bhp and similar torque..... I think that was a Bexley car...

My old man had a 635csi for about 12 yrs and that was a switchable auto and was pretty good fun but scary as sh*t in the rain TRX you see but now the 327i now feels alot like that with seemless delievery of it's modest power but it does manage to get the it down alot better in the rain. I have always liked the feel of the auto box and I can always switch myself if I fancy it...
Plus I can always use the M3 if I want a real manual.

I will take on board the advice on the cam a schrick 272 was on my list of things to do next...
so what does the remap actually achieve?? will I be better to do it before the cam/head work or once that is done?
I dont want to pay twice do I.. 8O

Cheers
maxfield
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Sun Dec 10, 2006 10:06 pm

do your cam and headwork first then a remap

remaps alter the timing of ignition and fuel for better economy and power
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MONSPORT42
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Sun Dec 10, 2006 10:15 pm

Yep, that was mine in Total. I was actually disappointed with those runs. It was sweltering hot day. Have had 237bhp on a cold crisp morning before the MAF conversion.
I find power delivery smooth as silk even in the rain. I've Bilstein suspension and 8x16 Alpinas on the rear which help. I change gear myself quite a lot of the time although in sport mode the changes are pretty close to optimum on the torque curve.
A remap is effectively reprogramming the chip for optimum air/fuel and timing all through the rev range and under various loads. It took over four hours on the rolling road and a couple of more tweaks to get my curves. So at around £50 an hour you really only want to do it once you have all your mods done. Your ecu will adjust to the changes in a general way in the mean time.
In my experience the 2.7 wants more air hence the MAF, bigger throttle body and ITG filter. My head's extensively gas-flowed and ported, etc. I've still got the standard manifold. I've still got the standard cam too. With a higher lift cam you can lose low down torque which for most driving is where the fun is. You would get a better bhp reading high up the rev range though. I just don\t spend my life at over 3,500 revs.
Hope that helps.
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beardymat
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Sun Dec 10, 2006 10:19 pm

some real world figures from my 2.7 touring

etta bottom end having covered @ 214k without any work topped off with an etta head fitted with 325 valves and ported to 325 spec

dyno`d before remap

189.7bhp @ 5700rpm
209.3 Lbs/ft torque @4400rpm

dyno`d after remap

190.3bhp @ 5425rpm
217.7Lbs/ft torque @ 4075rpm

no mods at all and the bottom end is a little tired (small ridge at top of bores). pulls like a train from low down as it is but with a bit of money spent it has a lot of potential.
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Andyboy
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Mon Dec 11, 2006 11:34 am

MONSPORT42 wrote:Yep, that was mine in Total. I was actually disappointed with those runs. It was sweltering hot day. Have had 237bhp on a cold crisp morning before the MAF conversion.
On an auto that would be about 190 bhp - that power figure is due to the dyno not being able to read engine braking properly. NO WAY a 2.7 with a standard cam and throttle body and AFM would do 237 bhp, absolutely no way at all. That's the same power the US 3 litre 24v M3 does and they already have quite 'adventurous' cams.
A really, really good 2.7 with an air flow meter does 210 bhp if you're lucky.
A really nice 2.7 was my Griffin hybrid with a 2 .7 crank and 325i pistons, 325i litre head and 270 degree Piper cam, 323i manifold/tb/AFM (with the inlet port on the manifold opened out), 10.2:1 compression and pulling a 3.25 diff. That was just so strong to drive and it would pull 60 mph in second gear easily because of the torque and high gearing. With a 325i inlet manifold and throttle body (due next year when the car is back on the road) it should be really good.
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