Thread: broken plug

okay thank you for beeing honest anyway.. can you answear me a question if a good tuned 250whp de-t can drive at wot for longer time?

yeah why wouldnt it be able to if you have everything correct these motors can handle a lot. I would say an oil cooler wouldnt be a bad idea and upgrade your cooling to a electric water pump with larger radiator.

well its many years ago when i boosted that car. it dies 2 years ago and i havent drive it till now when i swaped another(2nd) engine.... i still like it very much but i want to drive it hard on longer trips .. at least i have to know where its limit. THats why i bought the egt. Too bad i didnt find more info about de-t egt temp numbers and its relation with timing before

yea.. but my water temp never went over 100celsius when boosting the new engine. I was checking all thoose consult data nonstop on 7inch display on a dash..

yeah 800-900 celcius is not good and you will melt crap quickly. A properly tuned gasoline turbocharged engine not overboosting the turbo should run about 800-900 deg Farenheit. lol. You probably put a nice size hole in the side of the piston.

And yes a 250whp even t25 turbocharged SR can run for a long time straight without issues. At least mine did when I was at that hp level. 9.5:1 motor, JWT s4 cams, s13 t25, ss tubular manifold, 3" turbo outlet pipe dumping open, 10psi of boost. I could run it all day long with no issues, ran it up a 25 mile pass going from below sealevel to 7000 ft above sea level always in boost doing about 100-110 going up this mountain pass. Never saw out of boost, didnt melt any plugs, pistons, or overheat it at all the entire trip to Temecula California.

Didnt start having problems melting crap until I turned the boost up to 17psi and overboosted the turbo creating nothing but heat and high backpressure situations. On gasoline, not good. On E-85, probably wouldnt have had that problem as e-85 cools the air charge and because of the extra amount of fuel needed also helps keep egt's way down.

doesnt matter your saying your going to go WOT for over 5 mins up a hill im not taking any chances with a stock cooling system.

this sounds kinda unrealistic to me.. the worst thing is that when raising timing, the egt gauge shows lower numbers and when retarding timing, egt readings goe high. Anyway 900deg farenheit(=480deg celsius) is number what i was seeing on my engines when slowly cruising or idling

this sounds good

yea yea i was planing to try e85 on low boost as soon as gasoline tune will be finished

yes, but still.. it would not save the melted spark.. i had also nismo thermostat on the old engine ready to use ...

Its because your a/f ratio man, technically once you start hitting about 1200* F your getting to the point where bad things are going to happen.

I tuned my car to an 11.5-11.7:1 a/f under WOT and it worked great. But not even that a/f would save it from when it overboosted. Just too much for the little t25 to handle and caused problems.

But trust me it can be done, my buddies 240 has been running his same redtop det for 4 years now without a single issue, now has s4 cams, 555cc injectors, t25 at 12psi, and safcII to fine tune the fuel with. He auto X's it, drifts it in competitions and during private runs and your constantly wot the entire time basicly, races it occasionally and still on the same untouched motor.

yeah your right it wouldnt of saved you blowing the motor up and the way your watching your timing might be a problem as well. just turning the dizzy and looking at the egts isnt exactly a good thing. As ashton said also your tune and the way your going about tuning isnt the best.