Need more RPM's... How?

[Robes87GN]

After my mods last winter (head port, RJC power plate, valve springs, completely built up 200 4r) I started to spin, and couldnt even brake boost on my 275/50 nitto DR's. The year previous, I was sitting at 4000 rpms when I would launch, and finish the 1/4 perfectly aligned with topping out 3rd gear. This past summer I had a lot of problems with knock and tire spin, but what concerned me was even though I would spin a good 100ft down the track, I would still top out 3rd around 100ft short of the finish line. I am going to get 28" (had 26" last year) drag radials to give me more top end, but I will need more from what others have told me. Any help or ideas on parts that can give me more rpm through the gears would be great and much appreciated.

 

[BLACK6PACK]

What is your combo? your question is a little unclear. You say that you're topping out 3rd gear 100' before the 1/4 mile mark. You don't need more rpms you need less. As you were told a 28" tall tire will help with the problem. Your sig says you have a 12 second ride. I'm running 12.0 @115 on nittos that are only 25.75" tall and I'm running across the line at around 5500 rpm. How are you running out of gear and only running 12s?

 

[TurboDave]

I'm also trying to figure out how he's running out of rpm?

I go through the traps in 3rd gear in my mid 11 second runs, on 26" tires, and don't get much over 5200 rpm. Maybe 5400 on one of my 117mph runs.

 

[Rickracer]

Converter locked in 3rd?

That would definitely make a difference. If it's locked, it may be going away......

 

[QuickWrench]

...The year previous, I was sitting at 4000 rpms when I would launch, and finish the 1/4 perfectly aligned with topping out 3rd gear...

There's your answer. The car has a loose converter.

 

[kevin]

same prob.

with ac 9 inch nl.what do you do about it? i had a hueghes before and same thing.

 

[Robes87GN]

I have a brand new converter. It is stock replacement, but basically the same thing. What I meant by more RPM's is that I need to have a higher range with my gears. My trans got all decked out last winter, see if any of these may affect it. Blue clutches, stage 2 shift kit, kevlar bands, stock replacement converter, all new fittings and lines. I have a scanmaster, but left it on knock after checking my settings. Oh, and not to get off topic on my own thread, but my scanmaster reads 105 no matter what for fuel/air (BLM?) on my scanmaster, any clues on that?

 

[BLACK6PACK]

What do you mean by needing a higher range with your gears?

 

[Robes87GN]

To redline higher, to make my gears last longer down the track.

 

[BLACK6PACK]

If you have a fairly stock car, they don't like to go much above 52-5500. Get a shift light and a 5500 pil, put the car in 2nd, launch, let the car shift into 2nd on its own, and then when the light comes on, shift into third.

Do a search on low BLMs. That will give you all the info you need on why its reading 105. You have a problem that needs fixing.