getting euro GTS up to US spec power
Discussion
hi fellas,
my euro gts has had the airbox restrictor removed, air filters put on and a borla exhaust system with high flow cats (im told lol).
However im still not sure she will be up to the required 450bhp 490lbs US ratings,
what else would i need to do to get her to perform like a US spec car?
Would it be worthwhile getting the cats off completely and having a US ecu installed?
thanks in advance guys
my euro gts has had the airbox restrictor removed, air filters put on and a borla exhaust system with high flow cats (im told lol).
However im still not sure she will be up to the required 450bhp 490lbs US ratings,
what else would i need to do to get her to perform like a US spec car?
Would it be worthwhile getting the cats off completely and having a US ecu installed?
thanks in advance guys
this re-flash from Dan I guess would do the job, you need to send your ecu over I'd expect it to cheaper than buying a US one
http://www4.forum.viperclub.org/showf
I'm know there's a few euro members whom have swapped their ECU's
loosing the cats will make the car quite loud, it gives the car a totally different sound. I know a few owners here that went catless but they returned back to cats after a couple of weeks, hope you get on well with the neighbours If you ever decide to track your car youll never pass circuit noise regs
http://www4.forum.viperclub.org/showf
I'm know there's a few euro members whom have swapped their ECU's
loosing the cats will make the car quite loud, it gives the car a totally different sound. I know a few owners here that went catless but they returned back to cats after a couple of weeks, hope you get on well with the neighbours
If you ever decide to track your car youll never pass circuit noise regs
You might want to invest into some new rear tyres after today
LOL LOL............Had to give it a test drive.......
Fresh oil and a decent filter all fitted..
Couldnt check for what cats were fitted as the car has sill protectors fitten and i did'nt want to remove them.....
Just kidding on the test drive.. Viper club hummer
LOL LOL............Had to give it a test drive....... Fresh oil and a decent filter all fitted..
Couldnt check for what cats were fitted as the car has sill protectors fitten and i did'nt want to remove them.....
Just kidding on the test drive.. Viper club hummer
Edited by V1PER on Saturday 21st October 22:13
You should be pretty much there if not a bit over stock US power.
With the restrictor removed, K&N’s and a corsa I was making 460 BHP fly and 376 RWHP still with the EU ECU. When I put on the Bellanger headers and roe high flow cats that number went up to 504 BHP fly and 413 RWHP.
I cant recall what year they went to the tubular headers from the cast ones that mine had (Neil will probably fill in the blank quicker than google
), so it may or may not be worth your while to do headers depending on what you have already.
My guess is that I doubt there would be much gain in getting a stock US ECU as it still won’t be tuned to the mods you have or the fuel we use so you are unlikely to get a good ROI in HP terms. Probably better with a custom tune as above or a vec 2. There is still more to be had in mine as I am currently running a bit rich at the top end, I just need to find the time, money and expertise to get a vec 2 and properly tune it, at least at the moment its running fairly safe and I don’t really want to lunch the engine by trying to tune it when I don’t really know enough about what I’m doing.
As for going cat less, been there done that and loved it until I got fed up and worried about the ringing in the ears every time I went out in it, I actually measured 105 db in the passenger seat once and managed 138db at the exhaust before the guy holding the sound metre ran away so I didn’t get a top reading. Having said that it is an easy and cheap mod to do especially If you have a 3” collector on your headers as you just need about 18 - 24” of 3” tube each side, if you still have stock headers then you will also need a 2.5”- 3” adapter.
Didn’t get a dyno trace catless unfortunately so can not comment on what difference that made, I may pull the cats again and give it a go if the CCCUK have a another dyno day, just to see the difference.
Dave
Ps welcome
With the restrictor removed, K&N’s and a corsa I was making 460 BHP fly and 376 RWHP still with the EU ECU. When I put on the Bellanger headers and roe high flow cats that number went up to 504 BHP fly and 413 RWHP.
I cant recall what year they went to the tubular headers from the cast ones that mine had (Neil will probably fill in the blank quicker than google
), so it may or may not be worth your while to do headers depending on what you have already. My guess is that I doubt there would be much gain in getting a stock US ECU as it still won’t be tuned to the mods you have or the fuel we use so you are unlikely to get a good ROI in HP terms. Probably better with a custom tune as above or a vec 2. There is still more to be had in mine as I am currently running a bit rich at the top end, I just need to find the time, money and expertise to get a vec 2 and properly tune it, at least at the moment its running fairly safe and I don’t really want to lunch the engine by trying to tune it when I don’t really know enough about what I’m doing.
As for going cat less, been there done that and loved it until I got fed up and worried about the ringing in the ears every time I went out in it, I actually measured 105 db in the passenger seat once and managed 138db at the exhaust before the guy holding the sound metre ran away so I didn’t get a top reading. Having said that it is an easy and cheap mod to do especially If you have a 3” collector on your headers as you just need about 18 - 24” of 3” tube each side, if you still have stock headers then you will also need a 2.5”- 3” adapter.
Didn’t get a dyno trace catless unfortunately so can not comment on what difference that made, I may pull the cats again and give it a go if the CCCUK have a another dyno day, just to see the difference.
Dave
Ps welcome
Edited by viperdave on Saturday 21st October 22:02
Nice numbers on your car Dave worth every cent you spent, Charlie at Surrey Rolling remembered you well, especially your mission after the poor numbers the first time.
Don't think a US ECU is very much different either on my Gen II with Bellinger exhaust and hi flow cats I neary made the magic 500 but that did have the later headers.
Don't think a US ECU is very much different either on my Gen II with Bellinger exhaust and hi flow cats I neary made the magic 500 but that did have the later headers.
Hi Paul, sorry i couldn't make SRR this month as i was still in the US after VOI, i saw your SRT made good numbers though.
Your GenII seems in line with what Jan's ACR managed with similar mods and what sent me down the header route, There's definitely HP to be made from headers on the early cars that came with the lumps of pig iron, if nothing else it saves a few tonnes.
I'm still not sure thought that a US ECU would get good value as with other mods on the car and UK pump gas its still not the correct tune and your stuck with it, not many more $$ and you can get a vec2 and tune out any EU rubbish and make changes in future for any other mods.
Perhaps we need to dyno a US and EU ECU back to back in the UK some time to put this to rest, anyone want to lend me their ECU for the next dyno day???
Another thing to remember if changing the ECU is the year. The early ones don't care about rear O2's either and who knows what else is different, so not only is it US Vs EU its also 97 vs 02 etc
Your GenII seems in line with what Jan's ACR managed with similar mods and what sent me down the header route, There's definitely HP to be made from headers on the early cars that came with the lumps of pig iron, if nothing else it saves a few tonnes.
I'm still not sure thought that a US ECU would get good value as with other mods on the car and UK pump gas its still not the correct tune and your stuck with it, not many more $$ and you can get a vec2 and tune out any EU rubbish and make changes in future for any other mods.
Perhaps we need to dyno a US and EU ECU back to back in the UK some time to put this to rest, anyone want to lend me their ECU for the next dyno day???
Another thing to remember if changing the ECU is the year. The early ones don't care about rear O2's either and who knows what else is different, so not only is it US Vs EU its also 97 vs 02 etc
the lightweight better HP tubular headers were fitted in 99, the 2000+ creampuffs had the lightweight pistons and revised camshaft so you wouldnt want to put those ECUs into the earlier cars there must be a few other differences, like different timing etc
perhaps its about time we organised a club dyno day sometime next year ?
and of course we wont tell Spud
perhaps its about time we organised a club dyno day sometime next year ?
and of course we wont tell Spud
From Seans website....
For my aplication anyway......
This PCM is intended for use on 1998 - 2002 Vipers to correct the following check engine light conditions; Oxygen sensor heater circuit malfunction after header install, Catalytic converter fault after cat removal, idle hang and misfire codes.
www.roeracing.com/ProductCart/pc/viewPrd.asp?idcategory=8&idproduct=31
perhaps its about time we organised a club dyno day sometime next year ?
and of course we wont tell Spud
That sounds a good idea..... Spud can come but Skunk can only use 5 cyl LOL.........
For my aplication anyway......
This PCM is intended for use on 1998 - 2002 Vipers to correct the following check engine light conditions; Oxygen sensor heater circuit malfunction after header install, Catalytic converter fault after cat removal, idle hang and misfire codes.
www.roeracing.com/ProductCart/pc/viewPrd.asp?idcategory=8&idproduct=31
perhaps its about time we organised a club dyno day sometime next year ?
and of course we wont tell Spud
That sounds a good idea..... Spud can come but Skunk can only use 5 cyl LOL.........
Edited by V1PER on Sunday 22 October 08:09
that makes for some interesting reading
I did wonder about the fact the US cars run on lower grade fuel!
Baz the car looks awesome in those pics!!!! Cant wait for tomorrow!!!
I Wonder if a Dastek piggyback ECU would be a good alternative to a VEC2 over here in the UK as it can be set up and dynod by local chaps
I did wonder about the fact the US cars run on lower grade fuel!
Baz the car looks awesome in those pics!!!! Cant wait for tomorrow!!!
I Wonder if a Dastek piggyback ECU would be a good alternative to a VEC2 over here in the UK as it can be set up and dynod by local chaps
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