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Home > A-Series EFI / Injection > Throttle response: EFI vs SU

NDT

25 Posts
Member #: 11884
Member

31st Dec, 2020 at 05:50:10pm

I don’t want massive power (yet) but I’m tempted by wet manifold injection for my turbo build.
The one thing I do want is great throttle response (albeit with a little turbo lag).
Can anyone with injection comment on response compared to an SU?


Joe C

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12307 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

31st Dec, 2020 at 07:03:56pm

I doubt you'd notice any difference,

tbh injection should be better, as when somthing changes the ecu should react faster than the carb/dizzy.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



NDT

25 Posts
Member #: 11884
Member

1st Jan, 2021 at 03:29:45pm

Thanks and Happy New Year.
I won’t use a dizzy - I’m thinking SU and megajolt vs megasquirt.


stevieturbo

3588 Posts
Member #: 655
Post Whore

Northern Ireland

2nd Jan, 2021 at 04:09:16pm

If either are properly tuned, you will never notice a difference.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


Rod S

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5988 Posts
Member #: 2024
Formally Retired

Rural Suffolk

3rd Jan, 2021 at 05:03:14am

As both Joe and Stevie say, if you do it right you shouldn't see much of a difference.

It all depends on how much you prefer filing SU needles to multiple profiles, playing with different dashpot springs, playing with oil damper viscosity, trying to alter weights and springs inside a distributor...

Or just typing a few numbers into a laptop...

Schrödinger's cat - so which one am I ???

NDT

25 Posts
Member #: 11884
Member

4th Jan, 2021 at 06:21:55pm




On 3rd Jan, 2021 Rod S said:
As both Joe and Stevie say, if you do it right you shouldn't see much of a difference.

It all depends on how much you prefer filing SU needles to multiple profiles, playing with different dashpot springs, playing with oil damper viscosity, trying to alter weights and springs inside a distributor...

Or just typing a few numbers into a laptop...


Many years ago I bought an Avonbar high boost needle... so I naively thought I'd just be sticking that in the turbo SU when I rebuild it and not doing mch tuning after that!
After a 20 year restoration I should probably just focus on getting the car on the road and the SU might be the quicker option. Having said that, I'm seriously tempted by injection.
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