MkIndy7
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| posted on 5/6/08 at 09:02 PM |
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Pinto on TB's expected MPG
Well I kmow my titles quite specific..
But what are people getting (with carbs or whatever) or would be expecting from theirs a Pinto on TB's to get MPG wise?
We've got a Pinto with Yamaha R1 throttle bodies and a FR34 cam, we've had the head off etc and re-seated some of the valves and done all
the valve timing checks and clearances on it and the MPG for a reasonable run has risen from 15 upto 20mpg.
I think the Megasquirt is about tuned up correctly now, I'm struggeling to see where I can make inprovements there so I'm just wondering
if thats the best i'm going to get.
We were supposed to be touring round Scotland in it all weeked but at that MPG its just going to be too expencive 
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jacko
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| posted on 5/6/08 at 09:10 PM |
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Hi you know my engine pinto on zx9r carbs i got 30mpg going to newark last year
Graham
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MkIndy7
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| posted on 5/6/08 at 09:27 PM |
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Thats more like what i'd expect to get maybe even more being injection.
The AFR's appear good and lean off quite a bit under light load or cruise, the only setting that might help is "fuel cut on overrun"
but its easier to tune without that. And I can't seem to get the Acceleration/de-celeration wizzard to show and movement.
The only other suspisions I have is that the igntion timing isin't advancing properly (i've been told its been bouncing in the past when
the laptops shown it as steady), but If I advance it more in places it starts to pink.
And maybe that the R1 ITB's are too big for low throttle openings even tho they have throttle slides etc in them.
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Doofus
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| posted on 6/6/08 at 07:26 AM |
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My Pinto went from about 30mpg with 45 Webers (driving like my granny, but managed under 10 on a track too) up to about 35 (max) after GSXR bodies and
injection.
It was a 2.0L with big valve ported head.
Any use of the loud pedal did have a big effect on MPG though.
Paul.
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paulf
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| posted on 6/6/08 at 09:05 PM |
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My 1800 zetec gives about 30 with gentle driving and down to about 15 when driven hard, when had the megasquirted crossflow it was about 30 when
driven normally and low 20s when pushed.
Paul.
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Jenko
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| posted on 6/6/08 at 10:45 PM |
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quote:
Originally posted by MkIndy7
Thats more like what i'd expect to get maybe even more being injection.
The AFR's appear good and lean off quite a bit under light load or cruise, the only setting that might help is "fuel cut on overrun"
but its easier to tune without that. And I can't seem to get the Acceleration/de-celeration wizzard to show and movement.
The only other suspisions I have is that the igntion timing isin't advancing properly (i've been told its been bouncing in the past when
the laptops shown it as steady), but If I advance it more in places it starts to pink.
And maybe that the R1 ITB's are too big for low throttle openings even tho they have throttle slides etc in them.
Get a timing light on your belt pulley - even though Megatune shows advance, it only reads this from the rpm - So actually you may not be seeing any
advance - my 2ltr cvh has gone from 20 - 30mpg after installing TB's.
[Edited on 6/6/08 by Jenko]
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DarrenW
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| posted on 17/6/08 at 03:07 PM |
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Im sure mark Allanson was getting closer to 35 from his std ish pinto on injection.
I get 25 to 30 ish on carbs (will check on run to Newark at weekend.
Round the doors i suspect im between 20 to 25. hard to keep foot off throttle!
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MkIndy7
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| posted on 17/6/08 at 05:44 PM |
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Thanks for the kind of figures I should be looking for.
We've got Pinto EFI injectors spraying straight onto the valves at low RPM and then switching over to the TB injectors over 3K rpm.
We've been thinking that as the incoming air setup is different to the standard plenum then maybe the fuel isisn't atomising or mixing
with the air properly (even though it should atomise on the valve)
Last night I lowered the injector switchover point to 1K rev's and it was running pretty rich throughout the map so either the staging
calculations aren't entirely right or something different is happening if there's scope to lean off the mixture alot.
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