stock redtop w/ gt28rs upgrade, whats safe? how much boost will maf/fuel sys han

[mackdaddy240]

Well Its on and its working with stock lines, I looked in the oil feed and there is a restrictor in the oil feed on the turbo so I just used the stock lines and no restrictor since its restriced on the turbo. Well see what happens. Also the turbo has internal wastegate set at 12-16 psi, I have stock ecu 370cc injectors and a ka24e maf.... IS this safe????

I have prom chip, and flasher, not real sure how much more fuel to give and if ka24e maf can handle gt28rs also the 370 stock injectors kinda worry me anybody ran this much with this setup?Just installed a big fmic also.

[mackdaddy240]

Anybody?

[da40]

i think at stock boost(7 psi )youll be ok but anything higher then that is pushin your injectors to full capacity not to mention your maf will max out too,by the way do u have a bigger fuel pump u will difentley need this

[driftin_sr20det]

I run 14psi safely, no leaning out or nothing. I have a Access boost up ECU, though. I'm sure the maf is maxed but its not worth having the gt28rs without giving it some boost.

[mackdaddy240]

yeah I have my ecu tuned with a prom but it doesnt change fuel ammount all it does is allow the ecu to read more airflow then the stock ecu. i was going to tune it for a maxima maf and 550 injectors when I get the money. But the turbo wastegate is set for 12-16 thats the lowest setting. In this heat its only 12-13 when I floor it.

[highmilehatch]

Also the turbo has internal wastegate set at 12-16 psi, I have stock ecu 370cc injectors and a ka24e maf.... IS this safe????

No.

I run 14psi safely, no leaning out or nothing. I have a Access boost up ECU, though. I'm sure the maf is maxed but its not worth having the gt28rs without giving it some boost.

Stock injectors? Before you guys start melting pistons, get a wideband on it and verify your a/f ratios. Better yet, pick up a used Power FC and take your cars to an experienced tuner if you want to save your engines.

[mackdaddy240]

Yeah I'm getting a wideband next week and I'm going to try tuning my prom with it. But I still need to get an pyrometer

[mackdaddy240]

Well I borrowed my friends wideband o2 sensor, I just stuck it in the muffler to check the air/fuel ratio, with stock tune it was about 15-1 so I tuned the Prom a few times which got it down to 13-14 to 1 and 12-1 when giving it throttle. now when i boost at 12psi on my narrow band airfuel gauge it reads at the first green mark. I know that if it read in the yellow I would probably get a few more horses but I'm pretty sure this is safe for now. In a few weeks Im getting 550s of ebay for about $250 anybody know if they bolt and plug into stock rail and harness?

[highmilehatch]

now when i boost at 12psi on my narrow band airfuel gauge it reads at the first green mark. I know that if it read in the yellow I would probably get a few more horses but I'm pretty sure this is safe for now.

Please, for the sake of your engine just be patient and do things correctly. Those narrowband air/fuel gauges are completely worthless. Pretty sure safe isn't safe enough. Get a Power FC and get it tuned!!!

In a few weeks Im getting 550s of ebay for about $250 anybody know if they bolt and plug into stock rail and harness?

Depends if they are top feed or side feed. Only side feed will fit the stock rail. Are they Deatschwerks injectors?

[mackdaddy240]

I was considering Deatschwerks injectors, but I was hoping to find some cheaper ones on ebay.