Just had car tuned. Questions

[Nick_is_not_sus]

Hi, I'll go through what's been done to the car first... 800hp+ 120x400x450mm intercooler and plumbing, 1000cc injectors, 50mm turbosmart progate/screamer with 10psi spring. 3.5" exhaust (hence why the screamer) no cat just a rear baffled muffler. Adjustable FPR (boost controled) a gen 3 3584rs t51, with a 1.15A/R exhaust and pcmtec professional.

 

I am really happy with the tunes performace and explained what he was doing and why as he went and it pulls like a school boy for only 400rwkw. I told 400rwkw is my goal for safety was told I can go way above that but I want some longevity till I build another engine that I knows good. 

 

My concerns are .

1, My screamer just about makes no sound in 3rd and up and I don't hear it at all 1st to 3rd even though it's hitting boost targets and stable while stable pulling really well.

I asked the tuner and he said it was how efficient he's controlling and bringing on boost. I miss that aggressive wastegate sound.. pre tune 1st gear would hitting 3000rpm then just almost instantaneously hit 6000rpm with the wastegate screaming. The way it's setup I don't get alot of spin and it puts the power down and it's alot quicker from 3k rpm and keeps pulling more and more as the revs go up through to the limiter 

 

Can I get this more aggressive sounding while being safe? And keeping the power around the same level?

 

2, I noticed under wot in gears 3rd 4th haven't tried higher I see boost moving up and down about 1/2 to 3/4 of a psi I can hear it also. 

 

He mentioned it may need a small edit on portortional gain? And it wasn't a big deal to sort out.

 

3, there was some transmission edits done to the converter, pressures, shifts blah blah.

 

4, cruise control has disappeared 

I haven't brought this up 

 

Cheers 

[k31th]

definitely sounds like you need to talk to your tuner about those questions... we can give you some answers, but the relationship between yourself and the tuner is of utmost importance for what you want out of the car.

[Nick_is_not_sus]

Yeah, gotcha...he's away at the moment so I couldn't ask him. I opened up the tune didn't touch anything noticed there was a edit "vss speed" something and it says "not configured and before edit it was set on "TCM via CAN" I was curious to k ow if that's the cruise control issue

No issues on how it performs but since I can't hear my wastegate makes me feel like somethings not right. Maybe I am paranoid? but temporary NA isn't liking it at all 

 

Today I took it for a drive if I ease into it say 2nd to about 3k and floor it the wastegate doesn't open but if I give it half throttle in 1st and change to second and floor it the wastegate opens about 4k-ish and stays open in 3rd... maybe it's the spool time with a 1.15A/R ? I don't know

[Tom Tucker]

I would have thought the 1.15 would be lazy. Very safe choice for 400kw, but no way it'll be snappy

[Nick_is_not_sus]

It's not that bad I'm hitting full boost around 3k in 1st I probably should've gone for the 1.05

 

On 03/01/2025 at 5:55 PM, k31th said:

definitely sounds like you need to talk to your tuner about those questions... we can give you some answers, but the relationship between yourself and the tuner is of utmost importance for what you want out of the car.

I think I found why. I made a bracket to pin the internal wastegate shut (so I could swap out the external when it came time for a warrent of fitness) it would seem the bracket  had moved and it was opening ever so slightly even though I could move the actuator by hand. I've replaced the actuator and fitted a bolt into the preload adjuster using the actuators mounting bracket and locked the preload adjuter and locked again the bracket, seems like it should work and maybe sort the issue. Probably need to go check the tune checked.

Edited 05/01/25 11:07 PM by Nick_is_not_sus