Max safe boost? [Merged 10-6]

[Turbolaser]

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

 

[LordZed]

you need to get a fuel pump or you need to rewire the stock one... Check out Vfaq.com and AT LEAST rewire the fuel pump... Ill bet that at 16+ psi you are either running lean or knocking... Get a logger... You can actually buy the DSM-to-serial port cable that will hook up to a laptop or desktop... Then you can download (for free) a program called MMCD and a Palm Pilot Emulator and that will do everything you need.. Best of all, if you have (or know someone that has) a laptop then the cord will only cost you less than 50 bucks shipped....

You have to know what your motor is doing if you are going to mod anymore... Trust me, the last thing you want to see is cracked pistons or valves melted to your pistons and cylinder wall... Ive seen it... Its not fun...

Other than a datalogger and a 190lph fuel pump (or rewire the stock one your setup seems pretty solid

He said he has a rewired 255

Like everyone has said. As long as your monitering your AFR, 18 just fine. I'd say you could go up to 22 before you hit any limits. Perhaps higher. But it's all about keeping track of that engines fuel system.

 

[Diplomat]

"i ran my talon at 18 psi of boost with out changing anthing in the fuel system i had no problems with it..."

Also, what octane fuel were you burning? Do you guys get the 94+ Octane pump fuels up there?

"Like everyone has said. As long as your monitering your AFR, 18 just fine. I'd say you could go up to 22 before you hit any limits. Perhaps higher. But it's all about keeping track of that engines fuel system."

Yep. Personally, I'd have bought a logger way before some of your other modifications. Most are probably going to suggest that as long as you can keep a good A/F ratio and little to no knock, you're good to go.

I've always thought that a logger should be at the top of the list of upgrades, right next to "Aftermarket Boost Gauge". Because, even on a lightly modified car, it's still a great tool for troubleshooting.

 

[218dsm]

Hey guys...I'm kinda new to the dsm world so I just wanted to ask a quick question...I have a 1992 talon tsi...bored .30 over with all forged internals....just rebuilt and the only thing stock is the turbo...14b...I recently put my fpr on and still have not put in my 255 pump...how much boost is safe after i put the fuel pump in...and what should i set my fpr up to.....

 

[blkwidow]

What size injectors do you have? What do you have to tune with? I checked your profile but I didn't see anything.

 

[marcmsj]

Fuel pressure should be kept at stock levels, there's no reason to bump it up, it'll just throw your tune off. If you want to know what a "safe boost level" would be on your vehicle, you would need to datalog and tune as needed. What would you be using to tune? As long as you're not picking up knock, you'd be able to turn the boost up.

I'm not far from waldorf, let me know if you want to chill sometime and I could give you some pointers.

 

[218dsm]

I still have the stock injectors in right now...I have 750's waiting until i get the dsm link....I have fp at 43.5 with the vac line off and my boost is at 14-15lbs...im down to chill or go cruisin whenever....

 

[daren_p]

I still have the stock injectors in right now...I have 750's waiting until i get the dsm link....I have fp at 43.5 with the vac line off and my boost is at 14-15lbs...im down to chill or go cruisin whenever....

Only way to tell is to get a logger or wait till you have DSMLink. 14-15 psi is probably getting pretty close to maxing out the stock injectors. For reference I was seeing 107% injector duty cycle with my evoIII at 15 psi

 

[evoracer200586]

I was wondering how much boost I could run safely on the stock motor? I already did some research on it, but the only thing I could find was a guy that had the stock T-25 turbo, and he was told not to run no more than 18psi, but I dont have a stock turbo.

Check out my mods list on my profile, thats what I have done.

 

[Mr Peepers]

A t25 would only come stock on a 2g, you would come stock with a 14b even though it isn't relevant anyway. The only way to really be sure is with some way of logging. I don't see anything to compensate for your 550's such as a 2g mas or even anything to tune with. SAFC and a logger would work fine with 550's and DSMlink would work great and give you much more tuning abilities and much more room to grow. From what I have heard, a properly tuned/supported stock 6bolt motor in good condition can handle ~500whp.

I wouldn't go past wastegate pressure if you can help it without something to see what is going on inside your engine.

 

[evoracer200586]

Yeah I'm getting DSMlink soon, so then I'll be able to tune it well, and your saying that I should get a MAF translator with a 2 gen mass? Yeah and I know I dont have anything for tuning rigth now

 

[LaN-]

Yeah I'm getting DSMlink soon, so then I'll be able to tune it well, and your saying that I should get a MAF translator with a 2 gen mass? Yeah and I know I dont have anything for tuning rigth now

dont' get the maft, its a pain in the ass. Stick with the stock 2g mas until you outflow it, which won't be for a long time.

 

[JayRolla]

You can either go with a 2g maf, or a maf-t. You dont really say what size turbo you have so we cant really tell you how much boost. You just have to start tuning to find out. 400whp is where most people stop when tuning a stock motor, but they have been proven to handle 500whp.

 

[Mr Peepers]

You don't need a MAFT to run a 2g mas, you only need to do some simple wiring. A GM MAF and translator would work and is required if you are venting your BOV, which I couldn't see anything routed back into your intake and assume you are. If you are getting DSMlink, keep the boost as low as possible to avoid possible damage. You won't need a SAFC or logger with DSMlink, only an eprom ecu.

Edit: excuse my slow typing

 

[evoracer200586]

thanks guys, yeah 400whp is not bad. The turbo is a garrett T3/T4 with a A/R .70 housing. Here's the link to the turbo...
http://www.ssautochrome.com/level.itml/icOid/1489

it's the 7th turbo down.

 

[clsfatkid]

i just instald a boost gauge and i dont want to turn my boost up to high ive been told 15 to 17 pounds does that sound right

 

[thekellbeast]

Don't start turning up the boost until you get a logger of some sort. A cheap ass palm pilot will work perfectly as a pocket logger, and you'll know what's going on inside your engine.

But you can probably turn the t25 up to about 15-16. I was pushing about 17-18 on mine, and it blew up. That little 155k miles turbo just couldn't handle it.

There's a reason that a turbo upgrade is part of the 1st stage of modification for 2g's. I'd recommend having the t25 rebuilt as a t28, or buy a t28 and send in the t25 for a core charge. At least give yourself something to work with. T25 FTMFL.

 

[thekellbeast]

http://www.dsmtuners.com/sub.php?page=2gtstage1power

 

[pwayzjellyroll]

Don't start turning up the boost until you get a logger of some sort. A cheap ass palm pilot will work perfectly as a pocket logger, and you'll know what's going on inside your engine.

But you can probably turn the t25 up to about 15-16. I was pushing about 17-18 on mine, and it blew up. That little 155k miles turbo just couldn't handle it.

There's a reason that a turbo upgrade is part of the 1st stage of modification for 2g's. I'd recommend having the t25 rebuilt as a t28, or buy a t28 and send in the t25 for a core charge. At least give yourself something to work with. T25 FTMFL.

I second the logger. I payed 35 shipped for a refurbished M105 palm off eBay. Another 35 for the cable. Now when I install all my stuff this week and get ready to turn up the boost I can monitor knock and everything else so I know what's going on.

 

[Dsmboy1991]

I agree. The t25 is capable of the 15-16 but anything above that wont is not effeceint on that turbo. A logger is also a very good idea as well.


Jon Nye

 

[luvmygst]

You can turn the t-25 up to 16 but its putting out alot of hot air, and it will fall off on top end so dont be suprised when the boost starts to fall off. Your best bet is to find a cheap 14b and install it. When I first started on my 2g that was the best change I made.

 

[DGajre777]

15-16psi and shift at about 5500-6000 RPMs.

 

[oldman]

Settle down Beavis.... The reason your question was not directly answered is because it has been answered many times if you bother to read the entire thread, let me sum it up for you again.

"WE DON'T KNOW!!!!!, every car is different, yes even cars with similar mods. The answer to your question can only be found through tuning/logging process, anything less would be nothing more than a guess, AKA bench racing.".

 

[talon187]

ok ive got a big16g turbo stock injectors -6an fuel feedline 255 walbro pump fpr the stock fuel filter and inlet line are on the rail untill tomrrow when my fuel rail fitting shows. my friend told me i could push around 14psi ive got it on stock right now but ive got some creep issues ive seen it go to 20 ONCE and thats it but it has hit 14-15 a few times i didnt relaize it but ive stoped im just wondering how much boost is ok untill my external gate goes on thanks for all the info guys

 

[winterftbl]

The external gate wont matter if your injectors cant handle the boost. I would say 14psi tops until you get bigger injectors. Right now with stock injectors i am running 12psi without any problems.

 

[talon187]

i just ment i wont creep once the gate goes on