Max safe boost? [Merged 10-6]

[Turbolaser]

Is it safe to do the boost contol solenoid mod on a stock 1G?

 

[TT_NS]

Here are all the parts im getting for the car

Engine Re-build Kit
9:1 wiseco pistons
Super AVC-R (auto Boost Control)
Walbro-255 LPH (Fuel Pump)
Magnacore 8.5 Plug Wires
Eagle Rods
T4 Garrett turbo
34mm Flaper (for turbo)
Pacesseter Down Pipe
Turbo XS Blow Off Valve
High Pressure Cometic Head Gasket
MAF Translater
3” MAF
ATR 3” Cat-back Exhaust
Clinic 650cc injectors
Aeromotive FPR
3” Straight Inake Pipe
Upper Intercooler Pipe With XS BOV Flange
Front Mount intercooler
Tel Intake Manifold
Stage 3 Clutch
HKS Turbo Timer
EFI 75HP Shot Noss

 

[TimG]

Lol. I love when they make up a mods list that they pulled off of a web site.

Here's the deal. If you have proper tuning skills for fuel and timing, you can safely outrun the efficiency of most turbos on the market. 26psi on a T4 would be nothing for a well-tuned engine.

I'd suggest you do some research first though. An external wastegate is the way to go with that large of a turbo. Internal is just stupid. You need logging equipment for sure too.

Maybe you should just pay a professional in the field.

 

[4wd-Eclipse]

I'm daily running 9:1 > 18 psi, FP Green, 95 octen, WI...with 0 to 4 count of knocks.

 

[Stanford]

Originally posted by Groomz
Last time I checked, Honda's were internal combustion engines.

Stanford: You broke rule #3.

You have got to be kidding, Right?

It was an example, not advertising. If it was a problem I think one of the mods would let me know anyway.

 

[blackawdturbo]

Hmm, my 9:1 motor seems fine running 25 psi on a TD06H-20g and pump gas. *shrug*

 

[Shane818]

guys thanks for all the help. I now know to tune and set boost according to knock. I run 93 octance all the time so that should help out. I just want to run 15lbs daily on it. I am not going to race her that much or beat on her like i used to. I only made 2 plans to go to the track this year. and i planned a dyno run. But other than that no beating on her. I just dont have the money for when she breaks anymore. but anyways thanks for all your help.

 

[GeneralChaos]

I think either CR's should be fine but what I think should be said is...

higher CR for drag racing
lower CR for other (highway racing whatever)

now I could be wrong, but its what ive gathered in all of this.


and of coarse tuning is definately a key.

 

[Groomz]

Here's some info on this subject I found:

There are sound scientific reasons why there are no factory 10 to 1 CR turbocharged engines which produce specific outputs of 175 hp/L. In fact, there is NO production, piston, automotive engine which I am aware of which can achieve a specific output of this level on 92 octane pump fuel anywhere. Despite this fact, many people try to do this with expensive results. High compression ratios and high boost simply don't mix on pump fuel. If you try this, you will either be unhappy with the results or blow up the engine.

We talk to thousands of people every year with regards to EFI systems and modified engines. We get many people who just have to build a high compression turbocharged street engine. Even though we strongly suggest lowering the compression ratio, many people insist on 9 to 10 to 1 CRs. Usually these people phone back with sob stories of lots of pinging, blown head gaskets, melted plugs and pistons. We dispense free information based on 25 years of performance engine building experience to help people save money and disappointment. We frankly see very few high compression turbo engines running on pump fuel lasting more than a month before they fail. This is why you don't see any high power factory turbo cars with 10 to 1 CRs. Stick to under 8.5 Crs and you will make more power and have higher reliability.

Read all about it here:
http://www.sdsefi.com/meltdown.htm

-Groomz

 

[eclipseman99]

What is the most I can boost with my setup. I have a built block with 8:8 je pistons and eagle rods,s-fmu and a hahn stage 2 with fmic.What is the most I can boost without getting bigger injectors but still be safe and not lean out.

 

[Turbo 420a]

So are you still using the factory injectors? If so then I wouldn't go above 7lbs of boost with the stockies, if that much. If you have larger aftermarket injectors, then the maximum boost pressure setting will vary according to the size of those injectors.

Good call on the S-FMU

 

[eazy]

wow thats nuts

 

[yo2001]

26psi isn't a good idea. I hope you meant 16 psi. With my EVOIII 16G, my 550's injectors are 93-94% at redline with 20psi on pump. I had more than 232RHP on stock sidemount via HP caculator

 

[CanadianTSi]

If you only made 232hp you have some issue's....

 

[Mike 99GSX]

wow thats nuts

You ressurected a 7 month old thread to add that?

 

[BE4TNUT]

Yeah I know I have issues, car was not tuned at all and it was pulling timing like a mofo due to the boost set to high (it was dyno'ed without me there, I would not have let them boost that high if I was aware of the settings they used) the car was runnin rich also becaus due to the knocking they lost power with a leaner mix (they are not touching my car for tuning purposes again). DSMLink should be in soon and I will have it dyno'ed again when it is tuned nicely and I am expecting much more power, not sure if this will be before my FMIC is on or not though, if anyone wants updates just lemme know.

Also I wouldnt rely on a HP calculator for an accurate reading, especially talking rwhp on an eclipse, give me the site or program and ill punch in my info and you can see how wrong it probably is. Not trying to bash anything but I have always been against horse power calculators becasue there are way to many factors to consider.

Chris

P.S. I did mean 26psi, however that was only there for the 3 dyno runs that day and then i got there and they showed me and i fixed it to a safe level immediately.

 

[GaRn]

they do one thing, and thats ESTIMATE, they will never be completely right, or in some situations they will be completely wrong, but take them for what they are worth, guesses...

 

[BE4TNUT]

GaRn, you put that much better than I did, thanks, thats like exactly what I wanted to say.

Chris

 

[1fast97gsx]

no more than 17-18 psi without a fmic.

 

[yo2001]

Actually, 1/4 mi mph caculation is pretty accurate.

(mphxmph)/ET x Raceweight/1000

divided all that by 9.5


Doesn't matter, I'll dyno soon.

BTW, dynojet caculates HP by how fast you can get to xx mph to xx mph. Yes, it's just guesses

 

[91tsi_talon]

I have a 1991 tsi awd auto with just a dejon intake and im putting in a boost gauge and manuel boost controller this week. I'm just wondering what would be a safe psi to run at i was thinking 14?

 

[DoYuTurbo]

Ok just got a 2nd gen. GST and the guy i purchased it from said it is pushing 18PSi but it is not safe. can a t25 push 18PSI

 

[cuttheduck]

It "can" push that high but seems like the majority of people have it about 15psi.
Usually your car can actually feel slower pushing that much boost w/ the t-25 because
after about 15 psi it starts superheating the pressurized air. Plus the turbo will not last long at 18 psi. Try 15 maybe 16 psi and you'll probaly feel quicker, plus, your turbo will last longer for sure.

 

[PlayerZ]

15 psi is what almost everyone runs with a T25......

 

[greenmachine97]

i run 14psi, when i race, and 10psi for daily driving.

 

[DoYuTurbo]

thanx 4 the help most people say the 15psi thing looks like thats what i better do.