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guyus
04-03-2009, 20:44
New poster! (less than 10 posts)

just been pondering the question after reving my 5 to just over 6k,
what the the maximun revs most people take there cars to ??
regards Guy
rs250nut
04-03-2009, 20:47
All depends on turbo,cam,valve springs,crank etc:)
Tiny Tim
04-03-2009, 20:49
Cue Sparkie...
guyus
04-03-2009, 20:49
New poster! (less than 10 posts)

285 cam t25 turbo running 20psi,
just so used to my rx7 reving to 9,000rpm hehe
rs250nut
04-03-2009, 21:01
You have to remember this engine was first designed and used in the 1960s. Some have seen crazy engine speeds 8400 I remember hearing some time ago
Rob@Backyardracing
04-03-2009, 21:12
I normaly rev mine 7.5k depending on the set up.... as said tho depends on build and cam timing...
guyus
04-03-2009, 21:12
New poster! (less than 10 posts)

i know the engine is a very old design, push rod engines date back to the early 30s,
just wanted to see what the other guys on the club are takeing there cars to with the engine spec
jure
04-03-2009, 21:16
First gear well over 7.500. Others around 7.000 - 7.200 depending on charge temps. (BBPT GT cam, GT25 @ 24 psi and other goodies)
rs250nut
04-03-2009, 21:25
Need to get a diffrent cam in mine as I dont think im getting the best out of the turbo. Sightley off topic just noticed that your from Split in Croatia, I painted a large metal flaked orange boat that lives in that marina, do you know it?
guyus
04-03-2009, 21:43
Jure thats the sorta reply im looking for bud, with the 285 cam its like another boost of power from 5000rpm and the sound is genuis hehe:)
7500rpm seems a likely figer for a engine with a uprated cam,
Ben
04-03-2009, 22:03
Jure thats the sorta reply im looking for bud, with the 285 cam its like another boost of power from 5000rpm and the sound is genuis hehe:)
7500rpm seems a likely figer for a engine with a uprated cam,
got my limiter set to around 7200 to be on the safe side could go higher though. uprated springs very important though if your going to rev high. valve bounce sets in else, and pushrods go flying all over the place.
guyus
04-03-2009, 22:12
yep what happens when noddy's rebuild engine's and take short cuts lol
jure
05-03-2009, 06:06
Need to get a diffrent cam in mine as I dont think im getting the best out of the turbo. Sightley off topic just noticed that your from Split in Croatia, I painted a large metal flaked orange boat that lives in that marina, do you know it?

Sunseeker Predator 82 maybe?

This one:
http://www.salona-sailing.com/Portals/9/Netmedia.NETCharter/YachtPhotos/74-21-L-Sunseeker-Predator-82.jpg



OK... Lets get back to the topic... It really depends on the cam but also spool of the turbo. I had T25 (.48/.49) and it needed few hundred revs less than present GT25 to give all of it.
RichR
05-03-2009, 08:45
Take car to rolling road, get nice graph of where the peak torque is. Don't rev any higher than that because you won't be getting any benefit, just putting stress on the pushrods and valve gear...
Bigfoot
05-03-2009, 08:47
Take car to rolling road, get nice graph of where the peak torque is. Don't rev any higher than that because you won't be getting any benefit, just putting stress on the pushrods and valve gear...

Dont you want to go just above that because when you change gear you are closer to peak torque rather than changing early.
BriC
05-03-2009, 08:51
Dont you want to go just above that because when you change gear you are closer to peak torque rather than changing early. Yes, you do.
5teve L
05-03-2009, 09:06
I used to rev mine to 7200, James had 7800 on the rollers :eek: we thought it would pop :laugh:
Both cars had cams & bigger turbo's... Standard you're wasting your time over 5500-6k IMO.
Mart
05-03-2009, 09:09
Jure thats the sorta reply im looking for bud, with the 285 cam its like another boost of power from 5000rpm and the sound is genuis hehe:)
7500rpm seems a likely figer for a engine with a uprated cam,

Depends on the turbo spec too. Unless you have a T3 esque size blower in situ, there's not much point rev'ing to 7.5k rpm, and even if you do, it's not gonna be long before you start bending push-rods...unless you uprate them as well. And if you do that, it's probably not gonna be long before you start bending con-rods...unless you uprate them as well. And if you do that, it's probably not gonna be long before you need to improve the bottom-end lubrication side of things too. And if you do that... :sleep:
michael tierney
05-03-2009, 09:29
i was told that if u wanted 8000rpm you'd have to go steel rods and steel big end caps!!sorry that should read steel main bearing caps!!;)
Sparkie
05-03-2009, 12:28
start bending push-rods...unless you uprate them as well.

turbo 2 pushrods are thicker than gordini and gtt ones.... not that it helps much.:laugh:
The new Bill J
05-03-2009, 17:26
turbo 2 pushrods are thicker than gordini and gtt ones.... not that it helps much.:laugh:

Don't forget Colin's uprated pushrods as well ;)
James5
05-03-2009, 17:41
I used to rev mine to 7200, James had 7800 on the rollers :eek: we thought it would pop :laugh:
Both cars had cams & bigger turbo's... Standard you're wasting your time over 5500-6k IMO.


7.8K rpm @ track n road using a 293 deg cam with VNT turbo
Bigfoot
05-03-2009, 17:46
Don't forget Colin's uprated pushrods as well ;)

Those were very wide and hollow, which made them very light as well :)