z_speedfreak

iTrader: (3)

Screech! Bad *** man

BIGCAT7274

even at just 6k you should have enough gear. imo i would look your convertor a lot closer. because it sounds like your driving through it. i would guess your is slipping in excess of 20% and that's why the car appears to be running out of gear. how much rpm drop at each gear change?

robsquikz28

iTrader: (246)

EXACTLY ^

What converter brand do you have? It has to be blowing thru the converter especially at anything above 16psi. Is it even built for boost?

My car was only spinning to 6300 rpm and trapped at 157mph with 9.2s with almost a 3300lb car. IT had a boost converter on it and was doing 19psi and ran very strong from out the gate to the 1/4

xrambbc

yes i had that issue earlier this year, converter was flashing 5200 rpm in 3rd gear . . . the car weighs 3700 pounds with me in it.

im running a 9" TCI ultimate street fighter, only converter i could afford at the time, TCI told me its blower/turbo specific and is rated to 1200hp.

its most likely the converter but i honestly dont have the funds for a new one right now, nor the time to take it out, i have a spare thrid member to slap these 3.0 gears in and see if that helps, if not ill let it sit for a bit and when i get some cash stacked up ill go get a nice custom converter (which is whats needed at this point) never thought the car was going to be this fast or make this power, every one i saw with stock long blocks were in the 480 to 520 rwhp range on boost or nitrous so i kid of built the car around those goals, i knew i was going to push it but never thought it would make this kind of power and be this fast . . .

rear suspension consists of bmr double adjustable lower control arms, relo brackets, custom 3 way adjustable torque arm relocated, and an adjustable pan hard. nothing fancy just the normal crap for a 4th gen lol

doing the math im seeing 13% converter slip which is horrible!!! need to be around 4 maybe tighter . . . let me see what these gears do, if they dont help much ill shove the 3.25's back in and get me a new converter.

xrambbc

also please keep in mind im 7000+ feet altitude so my mph and et wont be too crazy, right now with a 10.38 that would possibly be a high 9 at a sea level track. the car should have a 145 mph if the converter was around 4% slip. 13% is retarded, im losing lots of time from that, i may just call TCI on monday and tell them there converters still suck hahaha

robsquikz28

iTrader: (246)

Just because its rated at 1200 hp does NOT mean its meant for boost!

Boost blows thru the converter faster than a nitrous car will.

That converter sux and I bet its more than 13% blow thru.

Buy a PTC converter for boost and it will be like 468 shipped to ya.

xrambbc

i understand that, but thats all i could afford at the time . . . .

xrambbc

i have a 6 month warranty on this one, ill call and have it sent back and ill go get a PTC, any specific part numbers to look for?

BIGCAT7274

When it comes to converters don't shop by part numbers. Call them and give them all the details of your combination. And don't be surprised if it is not 100% on the money the first time. They have to take a educated guess then adjust from there. Now all you need to do is decided who you want to work with. Ptc,pro torque,fti,ati,Neil chance are all top notch.

96capricemgr

iTrader: (1)

agreed it is unlikely you will nail a turbo converter first try, easy to set the stall too low and launch soft or set it too high have the engine build too much boost and blow through the converter. Find someone you trust and accept that you will likely be back and forth with the converter a few times.

xrambbc

sounds good, ill be giving PTC a call monday, thanks for the helps fellas.

gregrob

iTrader: (8)

That is completely wrong! There have been soooo many cars blown up from being too rich its not even funny.

xrambbc

i didnt mean it as i was way rich, 10.7 really isnt too rich IMO. 18* total i believe.

BIGCAT7274

10.7 is pig rich. its not as dangerous for boosted car as it is for n2o. but you are better off in the high 11's and is still plenty safe.

xrambbc

well we have had issues with cylinder temps when in the mid to higher 11's, first time we were trying it would torch head gaskets with 58* IAT's. then after that we noticed i was cupping the intake valve heads so bad they were .150" sunk into the bowl. then again i notice cupping of intake valves and two exhaust guides worked themselves .200" up smashing the seals into the retainers, cleaned the heads off in the jet washer and all the chambers were blue and purple from heat, oil temps were peaking 305* at WOT, car would spike temp just on trans brake load up.

richened it up, oil temps went down, egt's went down, and ECT temps stayed cooler.
it seems to be very happy at that.