what makes the power difference on the phase 1 and phase 2 vtr

30th January 2012, 10:56

mk1 vtr = 90bhp
mk2 vtr = 98bhp and slightly better fuel consumption

so what gives the phase two this extra? is it the way the ecu is mapped? or is it to do with the inlet manifold being slightly different? or is there more to it?

only reason i ask is im curious to see if il get the 98bhp or 90bhp from my phase 2 vtr conversion that came as a 3 plug but i will be fitting it 1 plugged.

30th January 2012, 11:23

iirc the differences on the mk2 are oil filter location, the cat is in the manifold, different map for emission regulations.

30th January 2012, 11:42

surely the oil filter and cat locations dont give it that extra mpg and bhp tho??

30th January 2012, 21:05

The extra bhp if any will come from the difference in air filter and air box, also the exhaust system is different , that's the only diffrence

30th January 2012, 22:19

Different ecu map, 98bhp engine has a roller rocker head and the 90bhp has a non roller rocker

I'm sure there's more don't listen to the clown above lol

30th January 2012, 22:20

Don't forget they did a 90bhp roller rocker lump in the early MK2s.

IIRC, the 8bhp power difference with the 3 plug lump was due to the revised inlet manifold (and probably some changes to the head too as it has a different port spacing), airbox and close-coupled CAT.

30th January 2012, 22:34

Quote:

Originally Posted by Liam_

Don't forget they did a 90bhp roller rocker lump in the early MK2s.

IIRC, the 8bhp power difference was due to the revised inlet manifold (and probably some changes to the head too as it has a different port spacing) and close-coupled CAT.

Like mine.

It's the engine map imo.

30th January 2012, 22:39

Added some things I'd forgotten to my post.

Quote:

Originally Posted by Heftydanielson

It's the engine map imo.

The 98bhp lumps (2001+) have the 3 plug ECU and had to obey stricter emissions laws IIRC - I guess that would explain the better fuel consumption.

30th January 2012, 22:54

Quote:

Originally Posted by Liam_

Added some things I'd forgotten to my post.

The 98bhp lumps (2001+) have the 3 plug ECU and had to obey stricter emissions laws IIRC - I guess that would explain the better fuel consumption.

I know they have different inlet mani and exhaust manis along side the ecu

31st January 2012, 00:39

From what i have seen, i stripped both types of engine and the later has bigger valves? Correct me if i'm wrong....

31st January 2012, 15:24

Different ecu map, 98bhp engine has a roller rocker head and the 90bhp has a non roller rocker

I'm sure there's more don't listen to the clown above lol

My vtr is 90bhp and has the roller rocker, don't say anything if you don't have a clue about the subject, you clown

31st January 2012, 17:54

Hahaha your the one that said the only difference is the airbox and exhaust design which gives 8bhp and better fuel consumption. People can barely get an 8bhp gain from aftermarket parts!

I think the most clear difference would be the change from single plug to 3 plug ecu which you failed to note

I've also owned an early mk1 and have now owned my mk2 for 3 years so I'm pretty sure I know abit on the subject

31st January 2012, 18:03

I know the exhaust on the mk1's is reallllly restrictive which clearly doesn't help! Its narrower than 1.4 centre sections. (obviously im not saying that is the reason but merely and observation)

31st January 2012, 20:59

I think we all no about the difference in the ecu, was previously noted before my input thanks

1st February 2012, 00:14

hmm this says otherwise

Quote:

Originally Posted by henryvtr

The extra bhp if any will come from the difference in air filter and air box, also the exhaust system is different , that's the only diffrence

1st February 2012, 14:49

Bhp wise I think what I said is true, I don't think the ecu will give more power, the ecu runs the thing, it can't upgrade the mani and airbox, Citroen did

1st February 2012, 16:44

Quote:

Originally Posted by henryvtr

Bhp wise I think what I said is true, I don't think the ecu will give more power, the ecu runs the thing, it can't upgrade the mani and airbox, Citroen did

so by your logic, any remap would be pointless

1st February 2012, 18:27

hmmmm well when i stick my phase 2 engine in with the phase 2 inlet etc. im running it on 1 plug ecu and loom and with a phase one exhaust manifold, i have got an induction decat and back box but i'll have to get it on a rolling road, see if the ecu does help. maybe its a combination of the exhaust set up, inlet mani, and therefore the ecu is mapped for them changes so also that will have a slight gain

Quote:

Originally Posted by XxAbzyxX

From what i have seen, i stripped both types of engine and the later has bigger valves? Correct me if i'm wrong....

iv read this somewhere else also

1st February 2012, 21:14

Not saying remap is useless , saying that the two ecus are prob running same maps but like when u add a mani or induction mod the ecu takes that into consideration, therefore enhancing performance