Supercharged Trailblazer 4200 I6

[bruhaba]

its in...one last photo before I cover it all up and it's no longer new. Heat shield will go on and all bracketry an intake gets installed. Exhaust is all fabricated and hung except for 12 inches to connect to header. I'm ready for this thing to be back on the road. Stuff takes me too long these days.

 

[Capote]

That looks beeeeaautiful! [emoji41]

 

[Tiggerr]

That looks beeeeaautiful! [emoji41]

+1 fantastic!!

 

[paulcmartin]

That's pure engine porn

 

[bruhaba]

Exhaust done, gauges and wideband in and wired, a few loose ends and we'll finally be back on the road.

 

[bruhaba]

https://www.youtube.com/watch?v=KIc8jLxvzp0

It sounds pretty mean when I get on it. Whoever said to straight pipe it is crazy.

 

[Capote]

https://www.youtube.com/watch?v=KIc8jLxvzp0

It sounds pretty mean when I get on it. Whoever said to straight pipe it is crazy.

Oooo laaa laaa, she sounds great buddy [emoji41]

 

[Sparky]

Your SES light is on

I love custom built stuff like this.

 

[bruhaba]

Gave it a tune today. Engine light is now off. I hadn't deleted the downstream O2 yet in the tune.

Impressive results. I couldn't believe it myself. About 18% more airflow! There was a lot of power couped up in that exhaust!!!!!!!!!!

Stock airflow 212g/s=291 hp

supercharged stock exhaust airflow. 268g/s=368 hp

New exhaust 315 g/s= 432 hp

 

[Capote]

Oh my god man, awesome results!!! Woo all that hard work played off

 

[24v 4.2]

Those are big numbers for the i6!

Nice work!

 

[Sparky]

I'm assuming at the crank given the first HP number. Won't get that at the wheels but lines right up with stock HP numbers which are at the crank.

 

[Tiggerr]

Those are some sick numbers!! Nice job! Wow! Especially on a stock short block!

 

[bruhaba]

Yeah... At the crank negative nelly Sparky. Just rough estimates to get in the ballpark.

 

[HARDTRAILZ]

Bet that will be fun to play with.

 

[Boricua SS]

I was gonna say, for a minute there I was pretty impressed with 432 at the wheels for an I6. But never the less, still a unique and productive build. Well done!

 

[Mike w]

I just hate seeing that Ford emblem under the hood of a GM.. Its like sacrilegious or something..


Good looking beast thou..

Gave a ford part a good use.

 

[Blckshdw]

How are your IATs looking? I know they were a concern of yours early on. Did those additional modifications do the trick?

 

[BlazingTrails]

2jz 3.0 i6 run 1500 hp. Why is it hard to believe a 4.2 could run 450? I think it could do 450 whp, I would love to see a dyno pull.

 

[Boricua SS]

Anything is possible on any platform if your pockets are deep enough. Guy on ssowners just put down 1150 RWHP and years to build and he blew it up on his 2nd pass at LS Fest last wk... 21 lbs of boost on a turbo. Would I spend that? Probably not. So to each their own.

I don't want to clutter up this guy's thread with the "this engine does this, and this one can do that" banter and take away from the great progress, uniquness, and outcome he's accomplished.

So kudos OP. Push her to the limits and have fun doing it!

 

[bruhaba]

I imagine my next crank pulley may break the engine. It's real happy right now at 6 psi boost. Next up is 12 with water injection.

Big problem...the slow opening throttle doesn't let it go any quicker off the line. It really was consuming near 20% more air but my time at the 1/8 was not any faster. Mph was 3-4 faster though. I need to come up with a way to get the throttle open. I'll log it to show you guys. I think it's literally 3-4 seconds before it's open from when you stomp it.

Im thinking 1-1/2" solenoid that bypasses the throttle body and whacks open at full throttle. Just have to think through the safety issues with that.

 

[Blckshdw]

Tuning the torque management didn't open the throttle any faster? I thought that's all that was...

 

[Mounce]

Same here, I thought it was the most common thing to tune out

 

[24v 4.2]

The throttle response is one of the main things addressed with a tune on this platform.

 

[Sparky]

It can be changed in the tune, I've seen the before/after of our throttle body response in a video and the default settings suck!

 

[bruhaba]

Only 08-09 platforms can change it in the tune. That video you saw is with an e67 pcm. Same ones on v8 GM stuff. Our p12,p10 from 02-07 cannot be changed. I guess I can't say I've completely killed torque management as I left some in there to help the trans survive. I'll kill TM and log the throttle and see if it changes. I don't think it will. I'm thinking people are a bit optimistic when they buy a tune.

 

[24v 4.2]

My 06 Trailblazer had the throttle response improved by pcm of nc. Maybe call and see what they do?

 

[bruhaba]

Most of what you feel is deleting the power enrichment delay and maybe some more aggressive timing. There are no provisions in Hptuners for throttle opening rate on an 06 pcm.

 

[Mooseman]

Send Jeremy at Lime-swap.com an email. He is also well versed in these engines. He swapped one into a Supra. I'm pretty sure that torque management can be disabled.

 

[BlazingTrails]

The torque management can be disabled I did it on mine. My throttle response is almost instant, if you goose the throttle you can hear air rush or thump into the intake.

 

[bruhaba]

I know how to disable TM. that's not the problem. I'll try it and record the data to see if it helps.

 

[bruhaba]

Alright, disabling torque management made no difference. Check out the logs in the photo. Literally takes the throttle blade almost 2 seconds to open when I slam the pedal WFO in 0.2 seconds.. No change whatsoever when I zero out the torque management table. No offense guys, but unless someone can show me some data i'm going to believe that you are all optimistically feeling what you want to feel after buying a tune. As I said earlier, power enrichment and spark timing are the knobs we can turn in the tune.

I bet these trailblazers will be completely different vehicles if we can figure out a way around this.

 

[Mooseman]

This video shows exactly what is happening, talks about it a bit too:

https://www.youtube.com/watch?v=VLsY7dYjenY

 

[BlazingTrails]

Alright, disabling torque management made no difference. Check out the logs in the photo. Literally takes the throttle blade almost 2 seconds to open when I slam the pedal WFO in 0.2 seconds.. No change whatsoever when I zero out the torque management table. No offense guys, but unless someone can show me some data i'm going to believe that you are all optimistically feeling what you want to feel after buying a tune. As I said earlier, power enrichment and spark timing are the knobs we can turn in the tune.

I bet these trailblazers will be completely different vehicles if we can figure out a way around this.

That statement is offensive. Just because you haven't figured it out YET doesn't mean it's not possible. Guarantee you mine opens fast.

 

[bruhaba]

Sorry man. I'm all about the data.

 

[bruhaba]

That video is of an 08-09 pcm. It's adjustable in those.

 

[BlazingTrails]

https://www.youtube.com/watch?v=srL0LvyYgU4

 

[Mooseman]

There has to be a way. It's probably buried somewhere in there. Did you contact Jeremy like I suggested?

 

[BlazingTrails]

There is Def a way, I might be willing to help if I wasn't being called a liar. Just saying

 

[bruhaba]

I didn't say "You are a liar". Please don't take it personally. By feel I thought my car was a lot faster when I first finished it until I looked at the data. The PE and timing tuning could be what you are all feeling. How would you separate that from throttle opening rate without data?

To be clear, I haven't lookat at older PCM's. I'm not sure aout 02-05 applications, but if it is the same PCM as mine 06-07; I'm doubtful based on what I have seen.