1G Auto gearing and RPM’s

Dstarperformance01 · Oct 13, 2021

I am curious as to what rpm range people are seeing going through the 1/4 mile with a 2.3 or 2.4(my car is a 2.4 w/ 2.0 head)? I know using 4th gear is a no no at WOT but, I feel I won’t have enough RPMS/gear to finish the 1/4 as those displacements don’t like rpm’s. Am I wrong?

NOSLO2PT0 · Oct 13, 2021

What kind of mph are you running? What size tires are you running?

Dstarperformance01 · Oct 13, 2021

@NOSLO2PT0 I haven’t tracked it yet(only got one shot before I get kicked out

)
235/60/16

jpmxrider489 · Oct 13, 2021

Dstarperformance01 said:
I am curious as to what rpm range people are seeing going through the 1/4 mile with a 2.3 or 2.4(my car is a 2.4 w/ 2.0 head)? I know using 4th gear is a no no at WOT but, I feel I won’t have enough RPMS/gear to finish the 1/4 as those displacements don’t like rpm’s. Am I wrong?

I also think I need 4th gear in my auto. My fastest so far is 12.9 at 120mph. I am fwd. When I get the end I'm at 7800 in 3rd but i need 4th.

NOSLO2PT0 · Oct 14, 2021

jpmxrider489 said:
I also think I need 4th gear in my auto. My fastest so far is 12.9 at 120mph. I am fwd. When I get the end I'm at 7800 in 3rd but i need 4th.

Raise the rpm. You got a LONG way to go in third gear

Dstarperformance01 said:
@NOSLO2PT0 I haven’t tracked it yet(only got one shot before I get kicked out )
235/60/16

What turbo?

Dstarperformance01 · Oct 14, 2021

@NOSLO2PT0 it’s a GT35R
I’ve watched some videos of autos at the track and they hit well over 7200 rpm’s in 3rd gear when going through the quarter.

jpmxrider489 · Oct 14, 2021

NOSLO2PT0 said:
Raise the rpm. You got a LONG way to go in third gear

Dstarperformance01 said:
@NOSLO2PT0 it’s a GT35R
I’ve watched some videos of autos at the track and they hit well over 7200 rpm’s in 3rd gear when going through the quarter.

This is true. However what is their rev limit? Mine is 8k. I could do 8500 but I want a safety net. On my holset, boost is falling off around 7k. So I'm not making more power at the higher rpm. If it was possible to use 4th, I could have power.

What's the 35r boost range?

Dstarperformance01 · Oct 14, 2021

@jpmxrider489 theirs runs around 8k plus it seems, mine is currently set around 65/6800 rpm’s as it’s a 2.4l and they don’t really make power too far beyond that . I’m currently running 35psi

Dstarperformance01 · Jan 25, 2022

Dang, I’d figure there were some auto guys with a stroker/ larger displacement like mine that would have some input

1990TSIAWDTALON · Jan 25, 2022

Nah, we rip little bitty 2.0's so we can run them out to 9200.....no need for 4th

Says the man who's car hasn't ran in almost a year.
Honestly, I think you will need to run it a little further in each gear to get you to the end if possible.

Dstarperformance01 · Jan 25, 2022

1990TSIAWDTALON said:
Nah, we rip little bitty 2.0's so we can run them out to 9200.....no need for 4th
Says the man who's car hasn't ran in almost a year.
Honestly, I think you will need to run it a little further in each gear to get you to the end if possible.

Lol, I guess

1990TSIAWDTALON said:
Nah, we rip little bitty 2.0's so we can run them out to 9200.....no need for 4th
Says the man who's car hasn't ran in almost a year.
Honestly, I think you will need to run it a little further in each gear to get you to the end if possible.

You know my current issues

I don’t know, I may just have a street car(1/8th)setup

1990TSIAWDTALON · Jan 25, 2022

Well if the bottom end is built, and it has to be since its a stroker, it will handle a few more revs, you're just being safe. I don't blame you one bit! :thumb:

If its running out of revs, what cams are we working with?

Dstarperformance01 · Jan 25, 2022

1990TSIAWDTALON said:
Well if the bottom end is built, and it has to be since its a stroker, it will handle a few more revs, you're just being safe. I don't blame you one bit!
If its running out of revs, what cams are we working with?

It’s not a stroker Per se, it’s a 4g64(2.4l)bottom end and idk about crank but has Oliver I beam rods
I’m 90% sure they are BC280’s and they aren’t dialed in(stock cam gears).

NOSLO2PT0 · Jan 25, 2022

If it’s got Oliver I beams, rev that thing!!

Dstarperformance01 · Jan 25, 2022

NOSLO2PT0 said:
If it’s got Oliver I beams, rev that thing!!

Doesn’t that cut down on longevity? I didn’t think high revs were good on a 2.3/2.4. Am I wrong?

NOSLO2PT0 · Jan 25, 2022

Depends on your rod ratio. Magnus was spinning his stroker to almost 10k. Can’t speak for the longevity of that motor tho. Plenty of guys have run strokers to 8.5-9k with success.

enriquez2000 · Jan 28, 2022

Put in springs and retainers and rev away. Without them you risk floating valves at high rpms with stock cams. Kiggly himself recommended to stay at 7500 with stock cams as there isnt much power to be had past that anyway

Dstarperformance01 · Jan 29, 2022

enriquez2000 said:
Put in springs and retainers and rev away. Without them you risk floating valves at high rpms with stock cams. Kiggly himself recommended to stay at 7500 with stock cams as there isnt much power to be had past that anyway

Car has 280 cams, springs and retainers.

enriquez2000 · Jan 29, 2022

Dstarperformance01 said:
Car has 280 cams, springs and retainers.

Are you bouncing off your limiter at the end? With springs and cams you have plenty of room for rpm. I like to increase 500 rpm at a time until I have the speed needed. Remember this 500 will be across all 3 gears so it adds up. Depending on what springs you probably are safe to 9k though

Dstarperformance01 · Jan 29, 2022

enriquez2000 said:
Are you bouncing off your limiter at the end? With springs and cams you have plenty of room for rpm. I like to increase 500 rpm at a time until I have the speed needed. Remember this 500 will be across all 3 gears so it adds up. Depending on what springs you probably are safe to 9k though

I thought originally that high rpm’s 2.3’s/2.4 isn’t good. After doing some digging on here I found out that a girdle and dampener w/ the I beams I have, i should be okay to 8500.

I haven’t tracked the car so I have no idea, turbo just took an exit so I’m I’m trying to figure out what one I’m going to go with.

enriquez2000 · Jan 30, 2022

Dstarperformance01 said:
I thought originally that high rpm’s 2.3’s/2.4 isn’t good. After doing some digging on here I found out that a girdle and dampener w/ the I beams I have, i should be okay to 8500.

I haven’t tracked the car so I have no idea, turbo just took an exit so I’m I’m trying to figure out what one I’m going to go with.

8500 should get you where you need to be.

Dstarperformance01 · Jan 30, 2022

enriquez2000 said:
8500 should get you where you need to be.

I’m only going to run it to 8ish once I get a dampener and figure out my turbo situation

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