Discussion
I've been considering getting a set of headers for quite some time and have been doing some research. Firstly anyone who looks on ls1gto.com will notice that they all put long tube headers on their gto's and rave about the performance gains. Does anyone sell these in the UK? Also, Whats the difference between the LT's and 'tubular exhaust manifolds.?'
Thanks in advance.
>> Edited by booster on Sunday 2nd October 19:20
Thanks in advance.
>> Edited by booster on Sunday 2nd October 19:20
The headers that we sell are long tube headers; in different countries they call them different things. In Aus they refer to them as either 4-1 or tri y's depending on the configuration of the pipes. The ones that you saw on my car at Silverstone are 4-1's. I have felt and heard a noticeable difference from the headers and exhaust on my car.
Hi Brian,
Look at Oz sites and you will see 4 into 1's are the main choice with either Pacemaker or DiFilipino as brands (Pacemaker seem the most common).
4 into ones seem to give top end horsepower, tri y's low down torque at expense of top end..at least that is what I have read.
I have Pacemakers and they were fitted with a decat system after I had a cat back upgrade. The difference was fantastic. I know you have most of that already so I am not sure you will see the difference I did. All I know is that if you want more power you need to change the headers and that prepares for the next stage!!
I guess it depends on what you are after! If it is acceleration your money might be better spent on the diff swith. I had the upgrades to get me the power/torque (circa 440/450) but the diff came afterwards and the 'difference' was awesome. Slam in the back that you are used too in second happening in 3rd and 4th at 80/90 etc. Give me call.
Or you could just go supercharger route!! But you might need headers for that anyway?
Look at Oz sites and you will see 4 into 1's are the main choice with either Pacemaker or DiFilipino as brands (Pacemaker seem the most common).
4 into ones seem to give top end horsepower, tri y's low down torque at expense of top end..at least that is what I have read.
I have Pacemakers and they were fitted with a decat system after I had a cat back upgrade. The difference was fantastic. I know you have most of that already so I am not sure you will see the difference I did. All I know is that if you want more power you need to change the headers and that prepares for the next stage!!
I guess it depends on what you are after! If it is acceleration your money might be better spent on the diff swith. I had the upgrades to get me the power/torque (circa 440/450) but the diff came afterwards and the 'difference' was awesome. Slam in the back that you are used too in second happening in 3rd and 4th at 80/90 etc. Give me call.
Or you could just go supercharger route!! But you might need headers for that anyway?
The Difilippo 4-1's have 3 inch collectors normally. They make their own hi-flow cats which mate up to the headers, which are 3 inch in and 2.5 inch out.
I too have Pacemakers on my car 4-1's 1 5/8 inch pipes. They have various sized pipes 1 3/4 and 1 7/8 available. Recently also had a cam put on the car too!
and one of the Textralia Clutches.
motomk
I too have Pacemakers on my car 4-1's 1 5/8 inch pipes. They have various sized pipes 1 3/4 and 1 7/8 available. Recently also had a cam put on the car too!
and one of the Textralia Clutches.
motomk
Hey Booster,
I have the Difilippo 4-1's fitted to mine with 200 Cell Cats and a 2.5" cat-back system, exactly as motomk describes. The setup was WRC supplied. The collectors are so huge that they even have space to put their name plate on. This is great when you're showing your system off to others
You'll need new cats if you want the Difilippo headers so if you've already had the cats replaced I'd go with Pacemakers headers.
The header upgrade will certainly give you a deaper tone to the exhaust. It might be worth doing the headers before the cams or both at the same time.
Cheers,
Comm
I have the Difilippo 4-1's fitted to mine with 200 Cell Cats and a 2.5" cat-back system, exactly as motomk describes. The setup was WRC supplied. The collectors are so huge that they even have space to put their name plate on. This is great when you're showing your system off to others
You'll need new cats if you want the Difilippo headers so if you've already had the cats replaced I'd go with Pacemakers headers.
The header upgrade will certainly give you a deaper tone to the exhaust. It might be worth doing the headers before the cams or both at the same time.
Cheers,
Comm
Hey Booster!
Mine has the 4:1 headers and the full system with decats, this is as supplied by Linden, im guessing its a Capa system?? Mild steel jobbie... will check my reciepts!
Anyway, not sure if you heard it properly at Santa Pod, but it dont half roar, pop & bang.. love it to bits... and as a result the car also goes like stink too!
Mike
Sean,
I've managed to source one from the US, its a comp cams cam shaft. for those interested the specs are:
232/236/113/.574/.578.
It's quite a large cam so I'm hoping to get around 40hp from it, coupled with headers should give me around 460 to 470 at the fly (at least thats what most of the US gto's are putting out with similar mods).
Most guys in the US view it as one of the best mods you can do - I'm suprised that not more of the UK guys are offering it.
Stevieturbo - Yeah I know about the headers, its a shame because they make some really nice ones for the gto. I'm also getting valve springs so no worries on that front!
>> Edited by booster on Monday 3rd October 21:17
I've managed to source one from the US, its a comp cams cam shaft. for those interested the specs are:
232/236/113/.574/.578.
It's quite a large cam so I'm hoping to get around 40hp from it, coupled with headers should give me around 460 to 470 at the fly (at least thats what most of the US gto's are putting out with similar mods).
Most guys in the US view it as one of the best mods you can do - I'm suprised that not more of the UK guys are offering it.
Stevieturbo - Yeah I know about the headers, its a shame because they make some really nice ones for the gto. I'm also getting valve springs so no worries on that front!
>> Edited by booster on Monday 3rd October 21:17
Thanks Brian. I have read in Oz that cam upgrades need various other supporting parts to obtain best results (Valve springs as Stevie says, ported heads etc.) and getting the right one/set up is a real black art.
High top end HP but a distinct paucity of power and torque at the lower end. Be very interested to see your esults as I have been looking at this myself.
High top end HP but a distinct paucity of power and torque at the lower end. Be very interested to see your esults as I have been looking at this myself.
Hi guys, Im almost settled on a cam myself.
You are certain to require new valve springs the comp cams -918's are the recommended. Booster the cam is quite chunky are you sure you will pass emissions? Word from the US is that anything over 224 duration is touch and go.
Also to make the best gains some ported heads are a good idea. You can get stage2 patriot ls6 style heads for $1200US assembled with springs etc.
Im looking at a 220-224 duration cam with 112 lobe sep. I have higher ratio rockers so the lift come out aroun .560 its a comp cams grind too.
Booster I think you might get close to needing new injectors too. But if I was doing a cam that size Id get some new heads. It will also allow you to run 11:1 compression. Id say you will double your gains with a good set of heads. Say around 75bhp total. Seeing as the engine is going to be apart anyway it makes sense to do the heads and cam at the same time... and maybe a FAST90 intake
..
The higher compression heads will give you more torque through the range as will a tighter lobe centre, which will also give you more lope. You can also install the cam slightly advanced which will shift the peak power down a few hundred rpm's if you want to bolster the lower end. The Futural F13 cam gets good feedback. The Ozzies like smaller cams, though I suspect this is due to fuel, emissions and noise laws there too.
Keep me in the loop guys Im interested on your findings. A good tune will also help the bottom end.
Rich
>> Edited by ringram on Wednesday 5th October 13:29
You are certain to require new valve springs the comp cams -918's are the recommended. Booster the cam is quite chunky are you sure you will pass emissions? Word from the US is that anything over 224 duration is touch and go.
Also to make the best gains some ported heads are a good idea. You can get stage2 patriot ls6 style heads for $1200US assembled with springs etc.
Im looking at a 220-224 duration cam with 112 lobe sep. I have higher ratio rockers so the lift come out aroun .560 its a comp cams grind too.
Booster I think you might get close to needing new injectors too. But if I was doing a cam that size Id get some new heads. It will also allow you to run 11:1 compression. Id say you will double your gains with a good set of heads. Say around 75bhp total. Seeing as the engine is going to be apart anyway it makes sense to do the heads and cam at the same time... and maybe a FAST90 intake
.. The higher compression heads will give you more torque through the range as will a tighter lobe centre, which will also give you more lope. You can also install the cam slightly advanced which will shift the peak power down a few hundred rpm's if you want to bolster the lower end. The Futural F13 cam gets good feedback. The Ozzies like smaller cams, though I suspect this is due to fuel, emissions and noise laws there too.
Keep me in the loop guys Im interested on your findings. A good tune will also help the bottom end.
Rich
>> Edited by ringram on Wednesday 5th October 13:29
0.560" lift, and thats with high ratio rockers ???
If thats the lift you expect with high ratio rockers, something sounds wrong.
0.560" is relatively low, even with std 1.7 rockers.
Most mildish cams tend to be around 0.570/0.580 lift with 1.7 ratio rockers.
Uprated pushrods can do no harm when upgrading cams too. Also worth checking lifter pre-load, which is a bit awkward. Pushrods are available in different lengths for setting pre-load, which again is a bummer to get right if the cams base circle is way off std, which many are.
If thats the lift you expect with high ratio rockers, something sounds wrong.
0.560" is relatively low, even with std 1.7 rockers.
Most mildish cams tend to be around 0.570/0.580 lift with 1.7 ratio rockers.
Uprated pushrods can do no harm when upgrading cams too. Also worth checking lifter pre-load, which is a bit awkward. Pushrods are available in different lengths for setting pre-load, which again is a bummer to get right if the cams base circle is way off std, which many are.
I would like to do heads but the funds are not available at the moment. There are plenty of guys in the USA making 380rwhp on cam only set ups which are good numbers. I'm slightly concerned about emmisions but since I'm already running catless anyway I guess I'll have to find a 'friendly' mot dealer! The lsa is 113 so idle will not be too rough but it will have that lovely lopeing sound!
>> Edited by booster on Wednesday 5th October 19:59
>> Edited by booster on Wednesday 5th October 19:59
Well as the car was bought with 1.8's in it, Ive got no 1.7's so am stuck with those designed for 1.8's which isnt too many. Comp Cams grind Im looking at is the XR273HR 220/224 with 0.530 and 0.534 at 112. Which works out at 0.561 and 0.565 if my calculations are correct.
A slightly less agressive lift will help with service life. Though you have got me thinking, just found some crane and lunati cams which end up around 224 duration and 0.580 lift... Maybe some more research.
I used to have the LT1 with GM Hotcam, not to different from the LS1 Hotcam, 218/224 or there abouts, used to break traction in 3rd gear going uphill in the dry at 90mph, so that was more that enough for me. Had it spinning the tyres all the way down the 1/4 mile, only stopping when I shifted in to 4th. Plus it was still able to drive off in 3rd gear and pull along the road in idle without stalling. Im looking to repeat the setup. That was with stock LT1 heads too, by all accounts around 340RWHP. So yes interesting..
A slightly less agressive lift will help with service life. Though you have got me thinking, just found some crane and lunati cams which end up around 224 duration and 0.580 lift... Maybe some more research.
I used to have the LT1 with GM Hotcam, not to different from the LS1 Hotcam, 218/224 or there abouts, used to break traction in 3rd gear going uphill in the dry at 90mph, so that was more that enough for me. Had it spinning the tyres all the way down the 1/4 mile, only stopping when I shifted in to 4th. Plus it was still able to drive off in 3rd gear and pull along the road in idle without stalling. Im looking to repeat the setup. That was with stock LT1 heads too, by all accounts around 340RWHP. So yes interesting..
Well for those with 1.8 rockers check out www.vincihighperformance.com/CAMSHAFT%20SPEC%20LIST%20PAGE%20LS1%202.htm
These guys have teamed up with Crane Cams and have a good range with many options. Nice.. Now I dont know what to get again..
These guys have teamed up with Crane Cams and have a good range with many options. Nice.. Now I dont know what to get again..
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