Recent content by Jonny00GT

So my tuner tweaks my tune for me cause the car will idle down and stall when it's cold, but gets better when it warms up. When I leave, it idles down to 1100rpm till I come to a stop and then it drops to the usual 800rpm and does this the first few cold starts. Then it slowly goes down...

My idle when coming to a stop has had periodic eppisodes of stalling. I had already replaced the IAC, cleaned the MAF and already have a new TPS. It doesn't do it all the time...just some times. Yesterday, when I got home, I replaced my FRPS and put the KB disk under it. When I started my...

How do I test if my oil pump went out or the relief valve went? 99 cobra motor w/ forged internals, but original oil pump. Car doesn't sound like it has no oil pressure, like when you first start if after an oil change, but there is no oil getting to the turbo where the mechanical oil...

I have a MP T70 .68 A/R on a built 99 4v Cobor motor. Oil feed line is 1/8" NPT and I have a .06 restrictor with 1/2" drain line. WOT warm oil pressure is around 90psi. I see no oil in the down pipe/exhaust side, just a little in the compressor side, mostly in the discharge pipe. I don't...

I'm wondering if I should drop down to 5w20 Mobile One oil. My oil pressure seems high from what people have told me to expect. 100psi or so at start up cold. Hot at idle, I may see 85psi, but never lower. With engine oil cooler, temp when warm stays around 200-220deg. I am pushing oil...

I've read too many people saying the electric ones went out. I can't seem to find a mechanical cable in a 3" though. Anyone make their own? I can feel that going from a 3" down pipe to dumped summitt 15" x 3" glass pack and switching to a Y pipe into stock 99 cobra cat back I lost power. I...

I hear metal cooling sounds like creaks, cracks and pops...not like anything broke, just like when hot metal is cooling off. Is this normal since these engines are aluminum and expand and contract?? -Jonny

I have the Mach 460 system stock radio and single CD player. About a month ago, the right side speakers front and back started sounding choppy, but only when the car is on. I swapped the interfeirence sensors from left to right with no effect and had the Alternator checked, but that's all good...

My current issue is, the belt squeals untill my car is warmed up. Annoying and embarrassing! I did a 2v to 4v swap. My buddy's 4v didn't squeal before I rebuilt it and dropped it in my car. I put his stock belt on and it squealed. I went up to O'Riley's and got a new stock length belt and...

I was wondering what the difference in the tune is between say 89 octane and 91 or 93 octane. With gas prices being crazy as they are, if all I need is less timing, change in fuel map, etc for 87 or 89 octane, why not do it? Does 91 burn cleaner than 87? Any insight would be great...

With not boost controller on my Tial 44mm wastegate: Large Green spring rated at 11.603psi I see about 16psi. Small Blue spring rated at 7.252psi I see about 10psi. (Per this chart: http://www.tialmedia.com/documents/w3_tial_44_sp.pdf) I'm wondering if this is a result of the design...

My wastegate does not dump back into the down pipe. I think the manual boost controller keeping it open at idle is messing with my idle quality. Do any of ya'll have a similar problem? (answered this myself...I was over thinking it. wastegate is well after the front O2s, so obviously it has...

I'm going to put some new plugs in and saw some of the Terminator guys with ported and assorted twin screws running and recomending the NGK R5724-9 or AR-93s as they seem to clean up idle quality and less likely to have spark blow out. Since I'm a 4v Turbo guy, I thought I'd see if anyone...

I think there is still room in my tune for improvement judging from my A/F guage, but with a fairly even amount of town and highway, I'm seing mid 16pmg on avge with 13# of boost and mid 500rwhp/rwtq...does that sound about right?? I thought my mileage would be better than this if I kept my...

I have a built 99 Cobra motor in my car with a single turbo. MAF is blow through with about 18" before the TB and about 9" fromt he final bend with a screen to smooth things out. At cold start, it's fine and I don't have to touch the throttle at all. If I drive it for a minute, park and try...