Max boost expected VS tuner

[oVeRdOsE]

Hi,
1st i'm new on that platform.

Base on you guys experience, I wish to set my mind on a boost target based on my setup .

I'm running JB4 settings based on log and knowledge found on forums and Terry from BMS, and I've decided to get services from a tuner to get most of it, and of course , safer.

The question is coming based on the tuner stating I wont be able to go over 18 psi on my setup, but since I'm a newbie, I tried many setting and reach 21-22psi with good logs.

Is 18psi is only what I can get? (please note we are on iteration 2, not done yet, might be higher)

• Speedtech 6262bb top mount
• Pump fuel 91 only available here.
• 5'' stepped IC
• BMS 50/50 meth 600cc single nozzle
• DI , no PI
• N20 TMAP
• JB4 gen 5 connect + BEF (file from BMS, pump fuel) : Map8
• Engine stock, intake stock, etc.
• Maintenance all done, including gen3 hpfp, index12, rod bearing, seals, coils (eldor), 2 step ngk, pvc , etc.
• 450lph lpfp + cooled EKP.

The GOAL is not to challenge the tuner, he got 100000x more experience than me dealing on jb4tech forum with Terry, but I'd like to have input from similar setup.

I wont disclose the tuner, since we are at iteration 2, so we might get more, who knows.

Thank you

 

[AzNdevil]

generally speaking it has always been a battle of "higher boost + less timing" vs "lower boost + more timing"
there is no right or wrong way to do it IMO

as long as there are no timing corrections (most tuner shoot for -3 on pump fuel for max power which is a big no for me) and no throttle closures, throw both tunes on the dyno and see which one is better, ymmv

 

[oVeRdOsE]

Great , thank you ! I really need to read more on that.

 

[oVeRdOsE]

So Terry helped me more on that and the car felt immediately better. He sent me a new .bin (probably a base one) and change few setting on the jb4.

Not bad, but not here yet.

- 94 oct
- meth : on
- map 2. Still dont understand why the boost target is so high on map 2...

datazap.me | cpt00 | map2 + meth trigg 1

datazap.me

Also got my bumper back from the paint !

 

[oVeRdOsE]

Any thought on this log.

despite a smaller side turbo (6262bb), 27psi seems a bit high?

Also dynojet 1.8.6 only shows 445whp (setting are ok, compared sinimlar setup from people posted they log while on the real dyno, and numbers were right on, pretty precise software I must say)


On 94oct + meth

datazap.me | cpt00 | map8 100 and 80 ff

datazap.me

 

[wheela]

Running that turbo with 94oct + meth at 27psi I'd expect much more that 445 whp? Not too familiar with expectations for running meth, nor jb4 logs, but I'd have thought you could run leaner and with more timing with meth added in? Hopefully others will chime in

 

[oVeRdOsE]

Running that turbo with 94oct + meth at 27psi I'd expect much more that 445 whp? Not too familiar with expectations for running meth, nor jb4 logs, but I'd have thought you could run leaner and with more timing with meth added in? Hopefully others will chime in

yeah, Ive compared dynos on this forum, jbtech and e90post, an indeed, should be higher.
Saw few people dynoying 440whp on stock TT and E30.

However, most people running around 27psi got bigger turbos, 64 and even 67mm, so more volume .

Terry's helping me on that, unfortunately most people have moved from jb4, but the old dyno results shows that it still very possible to push big numbers with jb4 still.

 

[SlowE93]

yeah, Ive compared dynos on this forum, jbtech and e90post, an indeed, should be higher.
Saw few people dynoying 440whp on stock TT and E30.

However, most people running around 27psi got bigger turbos, 64 and even 67mm, so more volume .

Terry's helping me on that, unfortunately most people have moved from jb4, but the old dyno results shows that it still very possible to push big numbers with jb4 still.

Jb4 is fine.
Has worked well for YEARS way before MHD was around.
So is Terry tuning for you ? I am confused. Or Treb ? Or ????

 

[oVeRdOsE]

I try to get Terry to tune for me, since I bought Jb4 , meth, downpipe (when I was TT), oil caps, and other item from him.
In cad$, so a exchange rate rip off.
But I pretty sure he wont give me a full services, we'll see.

Ive reached other tuners, but either they were not available or super expensive, in the near 2000$ cad !, or lack of motivation. One of them told me I shouldnt go over 18psi, and the .bin file was forcing the engine to have 0° timing, so I was around 220whp, lower than a bone stock. Ive asked question, and answers were pretty vague. Anyway, he never sent me a bill.

Tuner who knows Jb4 seem to be quite rare !

My last option is to lean myself, there's quite a good thread about this, but I dont want to risk it, since IU know there's someone who learned it the hard way and can help me .

 

[oVeRdOsE]

It was a very nice project, it's now completed, I missing only a rear m bumper .
Finished the interior ; leather, sport, m pack, individual, executive, cic, pdc, comfort access. Many many many hours !

 

[SlowE93]

Tuner who knows Jb4 seem to be quite rare !

Go to Terrys site. Hit up David (Trebila), he only does JB4 stacked tunes with MHD. He probably knows JB4 the best and won't over charge either.

 

[oVeRdOsE]

Go to Terrys site. Hit up David (Trebila), he only does JB4 stacked tunes with MHD. He probably knows JB4 the best and won't over charge either.

I saw this guy, his thread poped out lately.

Ive checked with terry, and no, he wont help me more than that, however he gives me direction to mess with the .bin file setting, but this is over what I want to do.

Ill check with David then

 

[SlowE93]

I saw this guy, his thread poped out lately.

Ive checked with terry, and no, he wont help me more than that, however he gives me direction to mess with the .bin file setting, but this is over what I want to do.

Ill check with David then

Yes, that is a good move for what you are after.

 

[oVeRdOsE]

so I've reached him .

according to his experience, 94oct and 600cc meth 50/50 mix, 440whp is pretty the standard.

I think is a bit low, he proposed me to help me, so this can be promising.

 

[wheela]

so I've reached him .

according to his experience, 94oct and 600cc meth 50/50 mix, 440whp is pretty the standard.

I think is a bit low, he proposed me to help me, so this can be promising.

For a 62mm full frame turbo running 27psi?

 

[wheela]

For reference, here's a guy running a speedtech kit with 63mm turbo and jb4. It has dynos of 93, 93 plus meth, and some with and without upgraded fueling. He's beating 440 by a wide margin. Slightly bigger turbo (6365 on precision speak) but not that big of a difference.

EWG N55 Speedtech BW EFR 8374 going for 600WHP+

EWG N55 Speedtech BW EFR 8374 going for 600WHP+

f30.bimmerpost.com

 

[oVeRdOsE]

For reference, here's a guy running a speedtech kit with 63mm turbo and jb4. It has dynos of 93, 93 plus meth, and some with and without upgraded fueling. He's beating 440 by a wide margin. Slightly bigger turbo (6365 on precision speak) but not that big of a difference.

EWG N55 Speedtech BW EFR 8374 going for 600WHP+

EWG N55 Speedtech BW EFR 8374 going for 600WHP+

f30.bimmerpost.com

from e90post dyno thread, this seems about right.

I was expecting around 500-520whp with my setup.

And my engine is low mileage and very well maintained. I did not do a leak test, but ''it should'' be good.


Terry told me to increase the timing... ok, Im doing mech stuff, he loose me on tunerpro

 

[SlowE93]

For reference, here's a guy running a speedtech kit with 63mm turbo and jb4. It has dynos of 93, 93 plus meth, and some with and without upgraded fueling. He's beating 440 by a wide margin. Slightly bigger turbo (6365 on precision speak) but not that big of a difference.

EWG N55 Speedtech BW EFR 8374 going for 600WHP+

EWG N55 Speedtech BW EFR 8374 going for 600WHP+

f30.bimmerpost.com

Instigator !