Printable Version | Subscribe | Add to Favourites
New Topic New Poll New Reply
Author: Subject: WOT in 1st gear?
cloudy

posted on 18/11/08 at 04:22 PM Reply With Quote
WOT in 1st gear?

This is aimed mainly at those of you with mid engine layouts - my car is geared for about 55-60mph in 1st and I can't use even 3/4 throttle without the needle immediately jumping to the redline. The alloys I'm using came with fairly cheap rubber - is anyone using decent tyres able to use full throttle with this sort of gearing?





www.warnercars.com

View User's Profile Visit User's Homepage View All Posts By User U2U Member
tegwin

posted on 18/11/08 at 05:08 PM Reply With Quote
WOT in 1st?.... your nuts!!!!
View User's Profile Visit User's Homepage View All Posts By User U2U Member
sgraber

posted on 18/11/08 at 05:15 PM Reply With Quote
Add more weight.



Ducks for cover!





Steve Graber
http://www.grabercars.com/

"Quickness through lightness"

View User's Profile E-Mail User Visit User's Homepage View All Posts By User U2U Member
MikeR

posted on 18/11/08 at 06:00 PM Reply With Quote
reduce accelerator travel :p

what size wheels have you got now? how heavy is the car? I suspect most will suggest the same as a seven if its similar in weight.

View User's Profile View All Posts By User U2U Member
cloudy

posted on 18/11/08 at 06:27 PM Reply With Quote
Car weighs 340kg, but that also means less weight to accelerate - better rubber then!





www.warnercars.com

View User's Profile Visit User's Homepage View All Posts By User U2U Member
v8kid

posted on 18/11/08 at 06:48 PM Reply With Quote
Just goes to show your engine has some grunt!

Most high performance cars will spin the tyres in lower gears unless launch/traction control fitted

I've found soft rubber helps but at a cost Kuhmo 275/40/17 work well with me but the wheels still spin - i guess it is a learning curve.

Have fun!

View User's Profile E-Mail User Visit User's Homepage View All Posts By User U2U Member
madteg

posted on 18/11/08 at 07:04 PM Reply With Quote
TOYO 888 will help. I have been running yokohama for 18 months could wheel-spin in third, then i tried some toyo 888 and noticed that i was getting a small squeak in 2nd. Goes like hell now.
View User's Profile E-Mail User View All Posts By User U2U Member
cloudy

posted on 18/11/08 at 07:14 PM Reply With Quote
Mad teg, which compound are you using ? CG or SG?





www.warnercars.com

View User's Profile Visit User's Homepage View All Posts By User U2U Member
djtom

posted on 18/11/08 at 08:11 PM Reply With Quote
No, first gear is only really any use for tyre warming.....






View User's Profile View All Posts By User U2U Member
madteg

posted on 18/11/08 at 08:31 PM Reply With Quote
TOYO R888 205/50/15 MEDIUM GG
View User's Profile E-Mail User View All Posts By User U2U Member
nick205

posted on 18/11/08 at 08:54 PM Reply With Quote
What's WOT...?






View User's Profile View All Posts By User U2U Member
cloudy

posted on 18/11/08 at 09:02 PM Reply With Quote
wide open throttle





www.warnercars.com

View User's Profile Visit User's Homepage View All Posts By User U2U Member
nick205

posted on 19/11/08 at 09:11 AM Reply With Quote
quote:
Originally posted by cloudy
wide open throttle


Aaaahh - I understand








View User's Profile View All Posts By User U2U Member
Dinoman

posted on 22/5/09 at 11:43 AM Reply With Quote
quote:
Originally posted by cloudy
This is aimed mainly at those of you with mid engine layouts - my car is geared for about 55-60mph in 1st and I can't use even 3/4 throttle without the needle immediately jumping to the redline. The alloys I'm using came with fairly cheap rubber - is anyone using decent tyres able to use full throttle with this sort of gearing?


Hi, If your rear suspensinn is too stiff then you can easly loose grip so soften your shocks and or springs, try shocks first turn them right down to full soft and you will see the difference if no difference then softer springs, but as usual it is a compromise betweeen cornering and accelerating, I hope that helps Regards DM

View User's Profile E-Mail User Visit User's Homepage View All Posts By User U2U Member
cheapracer
Builder






Posts 156
Registered 29/11/08
Member Is Offline

Photo Archive Go!
Building: The Worlds next big thing of course!

posted on 22/5/09 at 02:52 PM Reply With Quote
After rock hard old tyres you need to look at weight transfer or lack of it more to the point.

My net is too slow to look through all the build pics but I'm guessing the pivot points for the rear suspension Aarms both upper and lower are in a horizontal plane to the ground/car in general?

If so you have neutral squat and so you should first be looking at spring and rear shock compression dampning as suggested above, they may simply be too hard. Take a video from the side as you take off and determine what level of squat is has or lift at the front (theres a difference) if any.

I know you have videos but I cant get Youtube in China so if you put it up on Video.Google.com I would be happy to see what I can see besides the fact I simply want to see it!





It's coming....

View User's Profile E-Mail User View All Posts By User U2U Member
zilspeed

posted on 24/5/09 at 07:49 AM Reply With Quote
What kind of diff are you running ?

Other than that, damper settings and tyres ?

My old Locost would spin the tyres in first and second and chirp them in third when I first got it.
I kept backing off the rear dampers until they were fully soft and also removed the 15" wheels with innappropriate tyres and fitted 13" revolutions with Yokohama A-021Rs and the wheelspin was gone.
Other than that, one of the modern torsen type diffs may provide something of an answer.

Haven't driven a mid engined BEC car yet, myself, but the old GTM did not want for traction, hooked in and went.
At Kames, first 60ft times were up with the best cars and it only had 104bhp. Everything else P.O.d and left it after that.

I think that your answer is somewhere in the three points above. Other than that , it's down to suspension gemoetry which is starting to get a little bit fundemantal.






View User's Profile E-Mail User View All Posts By User U2U Member
les

posted on 24/5/09 at 09:32 PM Reply With Quote
christ! as above it must have some serious power

my avon has a 2ltr zetec with a few basic mods and i can floor it in 1st with no problems- providing you have the car straight. gearing is much lower than that too.

Les

View User's Profile View All Posts By User U2U Member
andygtt

posted on 25/5/09 at 06:49 PM Reply With Quote
My Ultima had a 60mph 1st gear and I could get WOT even though it was over 500bhp and 500ftlb and 1080kgs with me in it and full tanks... surface did make a significant difference as to what rpm I could get WOT at tho.

I recon you need softer suspension and/or better tyres... but we are all just guessing as it will bepend on the exact spec and setup of your car... does it have an LSD, does it break loose in corners etc etc.





Andy

please redefine your limits.

View User's Profile Visit User's Homepage View All Posts By User U2U Member

New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content © 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [© 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.