View Full Version : power gains from a X25XE ?
Any hints tips or cheats on how to get more power from a vectra GSI 2.5 V6?
it has a full stainless exhaust and he been de-catted,
suggestions welcome.:thumb:
oh and its going to be a trackday car.
turbo on each bank should do the trick.
I really wouldnt bother tuning the V6, I'd just leave it as it is, and spend youre money elsewhere, suspension decent brakes etc.
I have one as my daily, and they just seem lethargic to me.
MK i was thinking about a single turbo as it could be easier for space that trying the twin turbo route.
Paul, kinda what i thought, to much money needing spent for little power gain,
The X25XE is also the base for the DTM calibra's, so it's not an entirely useless lump, I'd bet most of the lethargic feel comes from a heavy fly and clutch combo?
The X25XE is also the base for the DTM calibra's, so it's not an entirely useless lump, I'd bet most of the lethargic feel comes from a heavy fly and clutch combo?
no. they used the 3,.2 v6 from the monterey.......
the best thing to do to a 2.5 is fit 3.0 cams.
the de-cat has made a difference, maybe a remap to suit the loss of the cat might help, also ditching air-con etc and full interior,
christ i dont even know what gearbox is in these lol my brother just told me he is giving me the job of track preping his car lol
mowgli MSD have done that already when the car was built,
ok, i didn't realise it was a special build...sorry...
lighten everything, its cheap.
the people who still play with the msd vectra challenge cars put 3.2 botton ends in.
no. they used the 3,.2 v6 from the monterey.......
the best thing to do to a 2.5 is fit 3.0 cams.
"All DTM cars at this time used 2.5 ltr. V6 engines. (2.5. ltr was the max permitted by the rules)"
http://www.f1technical.net/forum/viewtopic.php?f=5&t=9364
X25XE was the base engine, and the reason that the "Calibra DTM" is a 2.5.
mk1nova_rich
29-05-11, 11:06 PM
As MK said, the flywheel could do with going on a weight loss programme
afaik all gsi 2.5 vectras had the 3.0 cams fitted, so i was informed,
to be honest its an engine i have very limited knowlage of, i presume tb's are out of the question due to space?
Really wouldnt bother trying to tune one of these.
Id put the money into either a LET&F28 combo if he really wants more power.
More wisely spent on a decent set of brakes, some proper suspension and some decent tyres.
Theyre like an old boat as standard!
afaik all gsi 2.5 vectras had the 3.0 cams fitted, so i was informed,
Correct thats why 2.5 GSi had 190bhp and 2.5 SRi etc 170bhp
afaik all gsi 2.5 vectras had the 3.0 cams fitted, so i was informed,
to be honest its an engine i have very limited knowlage of, i presume tb's are out of the question due to space?
Seen them through the bonnet of a veccy before lol Throttle bodies are far from the be all and end all though, you could do quite well with a weight loss around the bottom end and a good cold air feed.
"All DTM cars at this time used 2.5 ltr. V6 engines. (2.5. ltr was the max permitted by the rules)"
http://www.f1technical.net/forum/viewtopic.php?f=5&t=9364
X25XE was the base engine, and the reason that the "Calibra DTM" is a 2.5.
the rules said the engine needed to be v6 & 2.5l & based on an engine from the range...
the calibra used the monterey engine.. the alfa used a version from the montreal, a car built in the 70s.
Maybe a later version was built with that but at least one of the Calibra DTM's was built on the X25XE base.
ive got an F28 and a let short engine but i want to keep that for a nova lol
i think the best action would be to put the fat bird on a slim fast plan, keep costs down on the engine and spend on suspension and poly bushes, it has 308 discs anyway so might just get better pads,
Paul what box is in these cars? we might look at a ATB diff as knockhill is really hard to get the power down onto the main straight out of the hairpin as the inside wheel is usually light and got no traction.
Maybe a later version was built with that but at least one of the Calibra DTM's was built on the X25XE base.
at most, one was built, before they realised it was crap.
F25, they're also crap, expect third gear sychro to sh!t itself soon if it hasnt already that is lol
na its still a good box as its been an easy going road car for 105k miles lol, what other box can fit on the X25 then?
F20 or F28 is best bet really
at most, one was built, before they realised it was crap.
http://kadettc-coupe.com/coppermine/albums/userpics/10001/normal_DSC00347.JPG
Picture of an alleged DTM engine there if anyone wants to spot some defining features from the block. However I was told it was a C25XE by the guy that designed it.
The actual engine name appears to be "Cosworth KF" from the thread here: http://www.migweb.co.uk/forums/car-talk/377726-calibra-dtm-real-racer-info-needed.html as obviously most of it is modified, the block however has to have it roots in a standard engine.
F20 or F28 is best bet really
we'll kill the F25 and then fit my F28 lol
mk what was the output of those engines?
thats alot of rpm lol
in thoeory, if we kill the X25 can the 3.2 bottom end be used with 2.5 heads?
I doubt it was limited back then, the later (i think?) Judd V8's still do around 10-11k though.
cool, thanks for all the reply's guys.
i feel the cheapest option is a crash diet, with suspension and brakes a priority, if things break we shall look into a LET conversion with F28 or perchance maybe a Z32SE
I'd look into a flat fly as that will improve the driveability of the engine no end, and make it much more lively. Possibly C20XE one fits? Big block stuff though, unless it's over 500 and 12k RPM I don't know lol
hmmmm im pretty sure ive got a flywheel lying around somewhere.....i'll dig it up
I wouldn't use one that's been buried, be a bit rusty.
na its lying in a puddle lol,
i think the best approach for us is to have fun with what we have and think about change when things break, after all this is all for a bit of fun and there will always be lads out there with deeper pockets and faster cars, we just want some track time to enjoy :)
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