Page:
Home > Help Needed / General Tech Chat > Running better at 3/4 throttle than full throttle??

pristic

User Avatar

189 Posts
Member #: 1774
Advanced Member

Sydney AUS

30th Sep, 2008 at 07:14:21am

Hi Guys,

Any ideas?
The thing goes NUTS at 3/4 throttle. it feels more powerful than at full throttle...

A/F is fine, doesnt lean out on full throttle or richen up - sits on about 13 the whole time.
Part throttle lean out pipe is NOT blocked off...
Not sure what else you need to know but its very strange.

Pete

1132cc Turbo ~120 bananas ATW - Fun Fun Fun


wil_h

User Avatar

9258 Posts
Member #: 123
Post Whore

Betwix Harrogate and York

30th Sep, 2008 at 07:51:04am

I'm not sure it's possible with the HIF but check that the butterfly only goes to fully open and not past it at full throttle.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


MadMatt

User Avatar

703 Posts
Member #: 105
1st to provide proof of a running Bimmy Conversion!

Brisbane ,Australia

30th Sep, 2008 at 11:57:28am

I`m with wil with the butterfly "over-open",,, but i`m also suspect on your "doesn`t lean out" thing,,, i`d be double checking that while you`re there.

also check the carb piston is actually reaching full tilt,,, ie: is actually able to get to the top of it`s travel.



www.miniman.com.au

"""LazyGoodForNothingSmartArseKnowItAllBackYardMiniMechanic"""

pristic

User Avatar

189 Posts
Member #: 1774
Advanced Member

Sydney AUS

30th Sep, 2008 at 12:01:40pm

Thanks Wil & Matt...

Ill get the lambda back on it asap... but im sure its ok.
Ill check the over open but I am almost 100% sure that when I had the carb off, I tried to 'open' by turning the throttle and it stops (ie/ cant physically go further than a certain point)

Cheers,
Pete

1132cc Turbo ~120 bananas ATW - Fun Fun Fun


Mr Joshua

2497 Posts
Member #: 1954
Post Whore

Luton Bedfordshire

30th Sep, 2008 at 12:44:59pm

Mine did the same, changed the needle, all good.

Edited by Mr Joshua on 30th Sep, 2008.

Own the day


Turbo Tel

User Avatar

1060 Posts
Member #: 588
Post Whore

Delaware, USA

30th Sep, 2008 at 01:59:22pm




On 30th Sep, 2008 MadMatt said:
also check the carb piston is actually reaching full tilt,,, ie: is actually able to get to the top of it`s travel.


Sounds like a plan, but difficult!! The only way I found was to make a sealed indicator.. The other way is to polish down your needle at station 11,12 and make sure that the WOT mixture gets richer (if it doesn't then the piston has not lifted to the top exposing those stations) Problem is your needle is then screwed...


What carb spring are you running and at what boost? I suspect some run over strong springs as it conveniently enrichens things.. I found an 8 or 12oz fine up to 12psi.

Terry

website:- http://www.terryhunt.co.uk


pristic

User Avatar

189 Posts
Member #: 1774
Advanced Member

Sydney AUS

1st Oct, 2008 at 12:40:47am

Hi Guys,

Its running 10-11psi boost now (was 15psi) until I get the new turbo... this week.

The spring in the carb is standard...

I also think its needles, but Grieg and Graham tuned it and said its running GREAT... at the time, we didnt notice the 3/4 vs Full throttle at that time...

1132cc Turbo ~120 bananas ATW - Fun Fun Fun


Turbo Tel

User Avatar

1060 Posts
Member #: 588
Post Whore

Delaware, USA

1st Oct, 2008 at 04:44:34pm

I wonder if its the opposite.. the piston is already all the way up at 3/4 throttle.. though that usually causes a leanout at WOT.


I would certainly think about a 12oz spring if you intend running 15psi. problem is it will change the whole needle and you will have to reprofile it..

Only surefire way to find out is to knock up an indicator..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=231607

website:- http://www.terryhunt.co.uk

Home > Help Needed / General Tech Chat > Running better at 3/4 throttle than full throttle??
Users viewing this thread: none. (+ 1 Guests)  
To post messages you must be logged in!
Username: Password:
Page: