1 7/8 or 1 3/4 extractors on stock ve commodore?! Go

[jonnyd1986]

1 7/8 4-1's or 1 3/4 4-1's extractors on stock VE SS commodore?!

I'd like do get the 1 7/8" extractors fitted with 100cpi racing cats with stock cat back.

My aim is to get a quiet but deeper note but more power through out the rev range would be nice.

Will 1 7/8 give me a deeper note then the 1 3/4?

I dont want to loose to much bottom end power. Is the difference much between the two?

I think a sponsor on here has done a few of these combos and getting good numbers but did the big 1 7/8's lack in bottom end?

Need some ideas asap because my car's booked in for this saturday 22 Aug. Still got time to change though. I've been talked into getting the 1 3/4 4-1 long pacemakers from the exhaust place. I got told that if i get the 1 7/8 that i'd loose bottom end power.

What do people think?

Thanks for your time.

Jon

[Shulkor]

Just thought id tell ya be careful getting the pacemakers if you are lowering your car a fair bit they sit very low under the car and scrap iv just replaced mine for that reason. other then that though i was happy with them.

[vassis]

Im no pro but doesnt tri y's give you more down low torque where the 4 into 1's give you more horse power and gains up top.

It may be something to consider or find more about

Also agree with Shulkor.. i have pacemaker tri y's on my SS which is very low and for the age of my extractors it has nearly worn thru at the bottom

Im considering welding a bash plate before it starts leaking and yet the extractors look a year or two old

Chris

[OOL51]

Me personally, I would go the 1 7/8 as once the power bug bites you may be left wanting more. So that way if/when you go to look at cams in the future the headers and cats are already setup for whatever setup you chose to go

[vassis]

Agree with OOL51

If future mods are in mind it might be best to make a plan or know what you want out of this car then decide what way to go

[jonnyd1986]

Thanks for the reply's. I dont think i'll be doing any big mods in the future. I'll probably get OTR and tune done in a few weeks and that would be for for power mods.

So the best option for a balance for top end and bottom would be the 1 3/4 with the mods i'm doing.

I'm after a deep note. Will the 1 7/8's give me a deeper note then the 1 3/4's?

Thanks

Jon


Just thought id tell ya be careful getting the pacemakers if you are lowering your car a fair bit they sit very low under the car and scrap iv just replaced mine for that reason. other then that though i was happy with them.

What extractors give better clearance for the VE's that give good performace?

x force stepped?

What would give a better power band? x force stepped 1 5/8 - 1 3/4 or pacemaker 1 3/4?

Wouldn't mind more low down power. That's the revs i drive in 90% of the time.

[Shulkor]

Thanks for the reply's. I dont think i'll be doing any big mods in the future. I'll probably get OTR and tune done in a few weeks and that would be for for power mods.

So the best option for a balance for top end and bottom would be the 1 3/4 with the mods i'm doing.

I'm after a deep note. Will the 1 7/8's give me a deeper note then the 1 3/4's?

Thanks

Jon




What extractors give better clearance for the VE's that give good performace?

x force stepped?

What would give a better power band? x force stepped 1 5/8 - 1 3/4 or pacemaker 1 3/4?

Wouldn't mind more low down power. That's the revs i drive in 90% of the time.


Mate i said same thing when i first got my car first it was just a exhaust to make it sound good then a tune and air intake one thing lead to another now its spastic as a tree :burnout: so dont totally rule out the 1 7/8's im sure the loss low down would be very small.

The 1 3/4 are more then capable of handling lots of power even if ya decide to do a supercharger or something like that later on down the track they will still be fine its really only the big setups that need 1 7/8.

As for sound iv never had the opportunity to compare them head to head on the same motor/system(im sure others here have) i think the deep sound is going to be more dependent on the cats & catback but you would expect the larger headers would contribute to.

My car is still in the shop i have changed to difilippo's thought i would move from 1 3/4's to 1 7/8's while i was at it to im expecting it back about Friday ill post back and let ya know how they go with clearance/hanging down.

A lot of people seem to be happy with the xforce gear me personally just as a personal preference wouldn't touch it but thats just me.


With what i said im not a professional on this and its just my opinion and at the end of the day its your choice/decision (im just trying to help)


Ian.

[SSV8TE]

Mate if you planning on a big cam and rpm over 6000 often go the long tube 1 7/8 but if you want bottom end and not planning on big cams etc go the try-y's they perform very well in the lower end of the scale and handle up to 340/50 rwkw's.
Cheers,
Andy.

[jonnyd1986]

Sweet thanks for the feedback.

Yeah i'll probably get the 1 3/4" pacemakers. Hopefully i wont loose to much ground clearance as my VE is quite low.

[HSVQUE]

Mines pretty low.. I find i dont have issues with my difillipo 1 7/8's hitting.. usually its my cats that rub on things but the front of my car is very lower.

[vassis]

I had no problems reving mine to 6 grand with OTR Tune and tri y's good to see others using other options other than the biggest option. My tuner said that my car had felt like it had more than the usual power he gets out of them.

[Shulkor]

How did you go jonny did you end up getting the pacmakers?

Got the car back the difillipo's do sit a fair bit higher.

[ssdamo]

1 7/8 4 into 1's sound alot better than 1 3/4 in my opinion.... i got 1 3/4 pacemaker and my brother inlaw has Difilipo 1 7/8 on his wagon, both have difilipo 2.5 catbacks, 200 cpi cats and his sounded alot better than mine.... till i got some 100 cpi cats and removed the front mufflers on mine :)

[Oztrack Tuning]

1"7/8 is my absolute preference and ive driven heaps of them. The L92 heads need all the help they can get on the exhaust side.

The extra size wont end up giving away any torque down low and sound better overall. Far less drony at below 2000rpm.