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Saxo Engine/Performance If you're interested in tuning Saxo engines, or if you need to know something which is engine related... this is the place for you.

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Old 29th February 2012, 22:21   #1
JNolan
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Default Is the TU5JP4-S more economical than TU5J4?

Is the C2 vts engine more economical than the saxo vts one?. According to manufacturers figures it's 8 mpg more combined. That's in a c2 to, so certainly would be even better in Saxo with less weight. thanks
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Old 1st March 2012, 08:56   #2
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Im running a JP4 with J4 cams and valve springs. its noticeably better on fuel and a miles more driveable engine. 125 miles to £20 driving to work which is 75% town driving and being sat in traffic.
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Old 1st March 2012, 09:00   #3
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my jp4 in my track car... which is a 110bhp spec ... not fitted j4 cams yet seams very good on fuel
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Old 1st March 2012, 10:27   #4
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My JP4S engine used to struggle getting 60 miles to 10 litre's.

Found it had a leaky injector lol. Since fixing that, I got 78 miles from 10 litres with 2 spirited drive's.

Which is alot better, i'll take it easy on the next 10 litre's.. see what it get's.
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Old 1st March 2012, 10:46   #5
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Quote:
Originally Posted by Mini-valver View Post
Im running a JP4 with J4 cams and valve springs. its noticeably better on fuel and a miles more driveable engine. 125 miles to £20 driving to work which is 75% town driving and being sat in traffic.
how do you drive?

with my xsi i am getting roughly 120 miles to £20, driving to work, although there are a few places that i do give it a boot full. lol
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Old 1st March 2012, 12:41   #6
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120 miles to £20 (15 litres) in the J4 I have
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Old 2nd March 2012, 14:42   #7
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main difference in fuel economy between the engines is the management system and the emission specs the ecu is set too + fly by wire throttle .
even the latest j4 engined saxo,s ran quite a bit richer than any tu5jp4 .
tu5jp4 runs lambda 1 up to 100%throttle angle up to 5000rpm ,then open loop omly above 90%throttle up to rev limter+ never any acceleration fuelling to the extent of the j4
j4 only ran lambda1 up to 4k and 70% throttle angle at any rpm and open loop above 4k+70%throttle
jp4 very slightly higher comp as well
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Old 2nd March 2012, 15:21   #8
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Pretty much all jp4's in saxos are running on J4 management though, so i imagine they won't be as good on MPG as the C2 with the proper ECU.

Last edited by saxova; 2nd March 2012 at 15:30.
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