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Diman969
Starting Member

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18 Posts

Posted - Oct 26 2004 :  18:36:28  Show Profile  Reply with Quote
Hi guys. I'm finishing bolting on kkk k27 turbo to my original M30 motor in 1990 535i (E34). I'm hoping to be able to push 15 psi of boost. But I want to make sure that my stock management system will be able to deal with positive pressure in the intake manifold. So far I'm thinking about either "Perfect Power SMT6" or "GReddy E-Manage" piggy back systems. Any idea which one would be better or maybe there is something else out there I can go with.
thx

qwikxr
Master Technician

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290 Posts

Posted - Oct 27 2004 :  06:32:06  Show Profile  Send qwikxr an AOL message  Reply with Quote
Whats the stock compression of the M30 motor? 15psi is pretty high for a normally aspirated motor, but Im not up on the M30 specs..
As for management, the SMT6 is a pretty good unit. A good friend of mine is a distributor for Perfect Power..

'85 745i turbo - 4 SALE
'87 Merkur XR4Ti 2.3L Turbo
'92 VW Cabriolet - ABA 2.0L swap - Turbo project - 4 SALE SOLD
'82 VW Scirocco SOLD
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Fellis
Garage Guru

Status: offline


125 Posts

Posted - Oct 27 2004 :  06:49:33  Show Profile  Reply with Quote
M30B35, the one in E34 and E32, has 9:1 compression ratio, so I belive it can take 15psi or more, just depends on tuning. With SMT6 the problem will be AFM which will max out well before these 15psi and as SMT is just modifying AFM signal it won't help much. You will in any case have to use larger injectors and higher fuel pressure and again no tuning will be possible by SMT6.

I will also be going for turbo in my E34 535, but I'll put whole M106 with M30 wiring and computer running ignition and Megasquirt running fuel. Idea also is to tune up to ~1bar of boost and then mabe either go for Megasquirt for ignition also or put one of older Perfectpower products UNI which will then be used to change ignition timing.



Janis
E34 535
E28 535 turbo
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tihuovin
Over 745 Posts!

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956 Posts

Posted - Oct 27 2004 :  07:20:38  Show Profile  Reply with Quote
For those who have plans to do so, i.e. modify his/hers E28/535 or E34/535 as a turbo, see eBay:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?viewItem&rd=1&item=7930441821&category=33742

Contains most of the needed stuff, if original Motronic ECU + wiring harness is used.

BR,
Timo
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345is
Moderator

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550 Posts

Posted - Oct 28 2004 :  16:41:44   View 345is's Photo Gallery  Show Profile  Visit 345is's Homepage  Reply with Quote
Diman 969, hi Im dan. I know that you can tune a e34 535i with a turbo and not do any mods to the DME, just have to get the cartech rising rate fuel pressure regulator, for increase in boost to match increase in fuel. the stock injectors will only take you so far, as far as how much fuel they will flow. you will have to have an air/fuel mixture gauge to make shure your not leaning out at the higher boost levels. as far as the air flow meter goes you will notice just by feel that the spring tension of the stock 535i AFM vs. the 745i AFM is acually more tension on the naturally aspired engine (535i) This is because of the turbo lag, less air flows through the turbo charged engine during low RPMs and anything before atmosphereic pressure. so that will result in lower tourqe down low, but once you reach boost then the power comes in.
so If you do any adjusting to the AFM it will most likly be less tension to accomidate for the lag. but then what about the fuel delivery for the high boost it will have less then naturally aspired engine right? not if you put a cartech rising rate fuel pressure regulator, this will acomidate for the more air flow, Boost! also the stock AFM from a 535i has an input voltage of 5v and an output range of 0-5 volts, the 745i AFM operates with a 10 volt input and 0-10 volt range. also a 745i AFM has a totaly different voltage output curve, it is more flat through the low load and at the higher load higher rpm it jumps up quickly to accomidate for the boost increase. but my point is that the 745i AFM is fully or close to fully open at the stock 6psi of boost, so you just logicaly think that you need to make spring tension higher so it wont be fully open until it reaches the new boost limit you have achieved. but that cant be done because it screws up idle and normal driving conditions. when you hit WOT (wide open throttle) the computer sends more fuel to the engine, on bolth 745i and 535i. so useing the stock air flow meter is fine you just have to accomidate the boost with more fuel by way of a carteck RRFPR. there is also devieces avlable that can modify your AFM's voltage signal to the computer at all different loads and rpms to be able to get the perfect fuel curve. even coming from you stock air flow meter, or you can even upgrade to a MAF sensor. But i could go on and on, I hope you have got some helpful info from this, good luck

Dan Miller
Miller Performance
Miller Performance
Email: dan@millerperformancecars.com
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qwikxr
Master Technician

Status: offline


290 Posts

Posted - Oct 30 2004 :  21:27:53  Show Profile  Send qwikxr an AOL message  Reply with Quote
Diman969 -
Ive got a SMT5 (same as SMT6 w/o extra injector controller) used 48hrs, great shape, $150USD plus shpg. if you are interested.

'85 745i turbo - 4 SALE
'87 Merkur XR4Ti 2.3L Turbo
'92 VW Cabriolet - ABA 2.0L swap - Turbo project - 4 SALE SOLD
'82 VW Scirocco SOLD
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Diman969
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18 Posts

Posted - Nov 02 2004 :  19:12:10  Show Profile  Reply with Quote
hi guys
sorry I didn't check in for a week or so. I did some more research and found out that PP makes SMT6 turbo kit, which is SMT6 and MAP sensor. any idea on that one.
and qwikxr thx for an offer, I'll pass for now but I'll defenatelly keep it in mind.
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Fellis
Garage Guru

Status: offline


125 Posts

Posted - Nov 03 2004 :  00:38:22  Show Profile  Reply with Quote
Just checked PP site and forum, and it looks like no SMT runs MAP sensor. New SMT7 has some new features like boost control, WB sensor control but nothing about MAP, just as all other SMP piggy backs it modifies air meter signals, lambda signals and it can run one addition injector.

Janis
E34 535
E28 535 turbo
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qwikxr
Master Technician

Status: offline


290 Posts

Posted - Nov 03 2004 :  11:09:11  Show Profile  Send qwikxr an AOL message  Reply with Quote
I spoke to my good friend, who is a PerfectPower dealer.. Here's the scoop..
You know of PP making a SMT6 "Turbo kit" and uses MAP?
** there is no SMT6 turbo, it is a regular SMT6 with a MAP sensor. Do you have people that want piggy back units?
will it/can it replace the VAM with a MAP?

**that is with the extra injector driver. yes it can replace the VAM/AFM but you will need to tune your ass off.
isnt that the SMT7?
**no the SMT7 and the SMT6 are the same execpt for the SMT7 is able to take some of the new cam signals to tune newer ECU's. basically what you are doing by replacing the air meter with a MAP is making the SMT output the voltage that the old unit did, it can get real hairy real quick.
Cool. Thanks for the info.
** np. well if people want them I will order as many as I can afford and supply them with the MAP sensor as a package.
hey Rik I am heading out, I just ordered two SMT6D's with a 2.5Bar Map. if anyone wants one, I'll cut them a break, since you know them.

Thank you again, Mike.
** NP, buddy!

'85 745i turbo - 4 SALE
'87 Merkur XR4Ti 2.3L Turbo
'92 VW Cabriolet - ABA 2.0L swap - Turbo project - 4 SALE SOLD
'82 VW Scirocco SOLD
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Diman969
Starting Member

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18 Posts

Posted - Nov 05 2004 :  05:25:04  Show Profile  Reply with Quote
hmm
I guess I'll have to figure something out.
What about MegaSquirt is it any good, or maybe convert AFM to MAF???
Sorry guys for all questions, I really apprisciate your help.
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qwikxr
Master Technician

Status: offline


290 Posts

Posted - Nov 05 2004 :  07:25:48  Show Profile  Send qwikxr an AOL message  Reply with Quote
quote:
Originally posted by Diman969

hmm
I guess I'll have to figure something out.
What about MegaSquirt is it any good, or maybe convert AFM to MAF???
Sorry guys for all questions, I really apprisciate your help.




No worries on the question count!
Im gathering more information on the SMT6 and SMT7 that may prove more useful. Like "self-tuning" and "learn mode"
As for the MS, tuning-wise, it is definitely like not knowing how to swim, and jumping into a shark tank.. Theres a chance you'll get bitten, but You learn to "swim" fast!
the MS learning curve is fairly small. The MS will give great flexibility. I'll keep you posted as I grab more knowledge of these tuning systems.
BTW, I have gotten my sticky fingers on the SMT Developers manual (good to have friends that let you borrow cool, technical stuff!)

'85 745i turbo - 4 SALE
'87 Merkur XR4Ti 2.3L Turbo
'92 VW Cabriolet - ABA 2.0L swap - Turbo project - 4 SALE SOLD
'82 VW Scirocco SOLD
Go To Top Of Page
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