Max RPM question

[6SENSE]

Curious as to what RPMs should I hit? Looking through my TLink recordings, a high RPM reading would be around 4600. Does this sound right? I know cam and valve springs would have something to do with max RPM (see sig below). Thanks.

 

[turbo nasty]

No quote but I believe it the stock shift points were 5400 or 5600 rpms. valve springs will hamper top end stability and pulling when they get tired.

 

[J Banning]

6SENSE: Are you talking about shift points with the trans in Drive, or if you were manually shifting it?

Level of mods will affect this, but with the trans in drive I think it's safe to say that you'd be seeing about 5,000 - 5,1000 RPM at WOT. Manually shifting? Depends on your cam & valvetrain combo.

-Banning.

 

[6SENSE]

This was in D or OD. I was trying to tune the car a bit by letting the speed fall to about 45-50mph then stomping on it till about 80-85 (checking for KR/O2s). Car would downshift to 2nd gear and rev to about 4600~rpm (according to TLink) then shift to 3rd. I would get off of it when I saw 80+ on the dash and let it shift to OD.
Now that I think about it, I guess that 4600~ max rpm # was just for 2nd gear. By getting off the pedal when I did I wasnt really giving 3rd a chance to build up (the cars in front of me would always get a little too close for comfort a little too quickly ). I guess the only question that can be answered is if 4600 sounds about right for 2nd gear. Guess Ive got to think of a better test for this, other than just waiting for the track to open back up.
Thanks
P.S. I guess those 5000+ #s you guys mentioned are in 3rd gear?

 

[J Banning]

> I guess those 5000+ #s you guys mentioned are in 3rd gear?

No. Recently I've been seeing right around 5275-5300 at the 1/2 & 2/3 shifts. I'm going through the traps in 3rd gear (28" tall tire) at 5200 with the convertor locked (119mph) and about 5450 unlocked (115.5mph).

-Banning.

 

[325DR]

Originally posted by J Banning
> I guess those 5000+ #s you guys mentioned are in 3rd gear?

No. Recently I've been seeing right around 5275-5300 at the 1/2 & 2/3 shifts. I'm going through the traps in 3rd gear (28" tall tire) at 5100.

-Banning.

Your car goes 11.30's with a Vigilante and you are going through the traps at only 5100? You must have the convertor locked then? My car goes 11.10's with a Vigilante unlocked at 5900 through the traps, and shifts out of 1st and 2nd at 5800.

 

[6SENSE]

Hmm, I feel like Im not looking at the whole picture correctly. Not sure if Im factoring in everything. I knew about the drivetrain (cam/valve springs) but I didnt think about the tires. Doesnt sound like Im calculating everything in that I should. Or does this sound like a obvious weak spring condition? Should I just try manually shifting to see to what rpm the car actually pulls to? Maybe shift points are just screwed up? Is this in the chip?

 

[J Banning]

Originally posted by AintGoinSlo
Your car goes 11.30's with a Vigilante and you are going through the traps at only 5100? You must have the convertor locked then? My car goes 11.10's with a Vigilante unlocked at 5900 through the traps, and shifts out of 1st and 2nd at 5800.

Yep AintGoinSlo, you're right... I messed up (I've now corrected my earlier post). The last time at the track I was locking the convertor and at the traps I was seeing just about 5200 even (119mph). With the convertor unlocked (115.5mph) I'm going through the traps at about 5500.

My fault... DUH!!

-Banning.

 

[blackbuick87]

Originally posted by 6SENSE
Hmm, I feel like Im not looking at the whole picture correctly. Not sure if Im factoring in everything. I knew about the drivetrain (cam/valve springs) but I didnt think about the tires. Doesnt sound like Im calculating everything in that I should. Or does this sound like a obvious weak spring condition? Should I just try manually shifting to see to what rpm the car actually pulls to? Maybe shift points are just screwed up? Is this in the chip?

You should start from 0 mph and make a recorded run letting the tranny do the shifting. Then tell us what it shifts at. May be something as simple as TV cable adjustment

 

[6SENSE]

Thanks Bob. As soon as the weather clears up a little I will do that.
When you say from 0 mph you are talking about from idle, not building up any boost, correct? Will tire spin cause any ill affects on the readings?

 

[J Banning]

Just from a stop. No need to build boost. Record it with turbolink then go back and see where each shift point was at.

 

[REDS HOT AIR]

geez...turn that thing up some ..I started manually shifting long time ago.

and thats right around 6000 but I sleep sometimes and it hits the limiter at 6200 ..

even when it was hotair with the 194/204 cam I shifted higher than you are.

 

[Ormand]

Shift RPM

6SENSE asked "Is this in the chip?" The answer is "no" it is not in the chip. The ECM doesn't control the shift points, that's all in the transmission. You can trim some metal off the governor weights and raise the shift points if you want, or you can just shift manually to get higher points.

 

[Nick Micale]

Originally posted by turbo nasty
No quote but I believe it the stock shift points were 5400 or 5600 rpms. .......

Stock shift points are at 4800 RPM.

 

[Weazel]

4600 rpms seems low. I just jam it in "D" and my car shifts from 5100 to 5200 in all gears. My car is pretty mildly modded (see sig) but does have the all important valvespring upgrade. I would agree with just putting it in "D", but if it's shifting that low you're leaving some significant horsepower on the table. Good luck, if you've got valvesprings it should shift at least close (very) to 5k.

 

[BoostedBug]

I say it is a simple TV cable adjustment. I do not see where the trans shift points are being controlled by valve springs. Yes you need better valve springs to turn it up a little more. Do a dead stop pass into 3rd gear and see where it shifts at. Also does it wan to be lazy going into OD? Higher rpms or lower or just doesnt feal like it wants to?

 

[6SENSE]

Thank you, thank you, for all the responses guys!
Weather is clearing up, so I will be getting the car out within the next day or two, if not tonight. As soon as Ive done the tests youve mentioned, I will post back.

P.S.

but if it's shifting that low you're leaving some significant horsepower on the table

Thats what Im saying!

 

[6SENSE]

Hey guys, was finally able to make a couple runs with Tlink.
RUN #1: 1st to 2nd gear shift @ 4825 rpm, 2nd to 3rd gear shift @ 4750 rpm.
RUN #2: 1st to 2nd gear shift @ 4050 rpm ( ), 2nd to 3rd gear shift @ 4825 rpm.

These were from complete stop/0 mph. Shifter was in OD, wasnt sure if that would make any difference. I get lots of wheel spin at mid to top of 1st gear through shift to 2nd (hey what can I say, its a TR; plus I need tires ). Dont know what type of effect if any this has on readings.

P.S. I was playing around the last couple of days shifting manualy (shifted at about 5200+) and I did feel a difference. Car was pulling throughout rpm range, and probably even more at top as the rpms rose. I kept running out of road before I could actually get anywhere in 3rd gear; had to get off the pedal .

 

[jojo]

Originally posted by Nick Micale
Stock shift points are at 4800 RPM.

Mine shifts at right around 4900 on the 2-3 shift. This is with fairly new valve springs.

jojo

 

[blackbuick87]

Pull off the uppipe and have someone mash the gas. make sure the throttle blade is completely horizontal.