J
JFB
Guest
How much horsepower or performance difference can you expect by going to Kooks headers with the stock exhaust from the mufflers back, on a Trilogy equipped Marauder? Who has the best deal on the Kooks?
BillyGman
New member
I would think that the best deal on a Kooks exhaust system can be had directly from Kooks, but I could be wrong. But since my car is only puting 400 HP to the wheels w/the Kooks system and the Trilogy set-up is intended to put 385 HP to the wheels w/an otherwise stock Marauder, then I'd say that I've only gained about 15 RWHP from the Kooks system once my car was S/Cered. But the Kooks system does make the car sound sooooo NICE!!!
FiveO
Somewhere in the middle
My car is Trilogy/Kooks equipped.
It made 426rwhp/407rwt.
I have a plasma booster module and a smaller pulley...so my educated guess is that it should be around 400-410rwhp depending on other minor mods...intake, etc.
A Kooks exhaust on a Trilogy machine makes an amazing sound.
It made 426rwhp/407rwt.
I have a plasma booster module and a smaller pulley...so my educated guess is that it should be around 400-410rwhp depending on other minor mods...intake, etc.
A Kooks exhaust on a Trilogy machine makes an amazing sound.
M
MI2QWK4U
Guest
FiveO said:
Ok, you got me...whats a plasma booster? The kooks are actually my next mod....
BillyGman
New member
Yeah, he lost me w/that "plasma booster" comment too. is that like a blood booster?MI2QWK4U said:
Anyway, Dave, you probably already know this, but incase by chance you don't, let me suggest that you check w/Lidio to ask him if a chip re-burn is needed w/the Kooks exhaust since your car is S/Ced. It might require a different air/flow ratio setting.
JET
Senior Member
Well this is the first time I've posted it but since adding the Kooks and a few other goodies from Lidio my Horse power has gone from 407 to 460 and my torque is has gone from the high 380's to just shy of 440. I thought my car was fast before but now it is scary. My best 1/4 mile times with the new power are 12.02 @ 117mph.
BillyGman
New member
I think that even though the Kooks system has given your car some more power, much more of that extra power is due to the high boost pressure your pushing w/that smaller pulley you've chosen. You went from 9.5 PSI to 12.4. A 3 PSI gain in boost is quite a significant jump. So I think that if you did that even w/out the exhaust, you still would've been at 445, or 450HP.
FiveO
Somewhere in the middle
Previous owner had the plasma booster module put on...I didn't.
Here's a link:
http://www.ignitionsolutions.com/
Here's a link:
http://www.ignitionsolutions.com/
BillyGman
New member
So then you're saying that your car gained 53 HP at the wheels from the Kooks exhaust alone? Can that be right? I've never heard of that on a S/Ced engine. If that's true, then maybe the headers and freer flowing exhaust benefit the 4.6L engine more once you get to a certain boost level. Is your 460RWHP figure on pump gas just like your 407HP figure was? And were both of the 407 HP and 460 HP dyno runs calculated in "S.A.E. corrected" figures?JET said:
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Best I can tell is that Kooks are worth about 20-30 RWHP on a MM that has a Trilogy making the stock 9.5psi of boost.
This is of course putting the Kook’s on a Trilogy MM that already has a better then stock MM muffler. And when we’ve done Kook’s… It’s been Kook’s and a 2.5” X-pipe with two high-flo cats plus upgrading the rest of the system to 2.5” as well. So to some extent it’s more then just a long tube header that’s being added to the car.
And on Trilogy cars that are upwards of 12-14psi, the full exhaust deal with Kook’s will net even greater gains at rear wheels.
Most of the Trilogy equipped MM’s that I’ve done now that are in the 13psi range, full 2.5” exhaust with Kook’s, good mufflers, better MAF will make about 450-470 RWHP and near 500RWHP with 100 unleaded race fuel tunes in them. This with 4.10’s and the stock, tight torque converter makes these cars go low 12’s, high 11’s with good traction and cool air.
Thanks
This is of course putting the Kook’s on a Trilogy MM that already has a better then stock MM muffler. And when we’ve done Kook’s… It’s been Kook’s and a 2.5” X-pipe with two high-flo cats plus upgrading the rest of the system to 2.5” as well. So to some extent it’s more then just a long tube header that’s being added to the car.
And on Trilogy cars that are upwards of 12-14psi, the full exhaust deal with Kook’s will net even greater gains at rear wheels.
Most of the Trilogy equipped MM’s that I’ve done now that are in the 13psi range, full 2.5” exhaust with Kook’s, good mufflers, better MAF will make about 450-470 RWHP and near 500RWHP with 100 unleaded race fuel tunes in them. This with 4.10’s and the stock, tight torque converter makes these cars go low 12’s, high 11’s with good traction and cool air.
Thanks
Constable
North East Marauder Member
If a Trilogy car (bone stock aside from blower) starts off making 9.5 psi, what is the boost pressure after the Kooks system and exhaust is installed??? I've read that modifications AFTER the blower tend to decrease boost pressure, while mods ahead of the blower will slightly increase boost. This is a very general statement... I don't mean it to be taken as fact. I also am not saying that the difference in pressure is major or significant.
The thing is this: Say you guys start off making 10 psi and about 400 hp. You then add the Kooks setup and gain 30hp (now 430 hp), but drop to 9 psi of boost pressure. Now go and fiddle with it to get your boost pressure back up to the original 10 psi. You'd see that the new power is around 440-445 (from the same 10 psi and the added Kooks).
These are just numbers I made up off the top of my head for example purposes. Do you guys understand where I'm going with this?? The Kooks may be worth more power than you think on an SC car... you're just not seeing that extra 10 hp or so because of the drop in boost.
Check out "Mods for 4V Mods" in this last month's MM&FF for more on this subject.
The thing is this: Say you guys start off making 10 psi and about 400 hp. You then add the Kooks setup and gain 30hp (now 430 hp), but drop to 9 psi of boost pressure. Now go and fiddle with it to get your boost pressure back up to the original 10 psi. You'd see that the new power is around 440-445 (from the same 10 psi and the added Kooks).
These are just numbers I made up off the top of my head for example purposes. Do you guys understand where I'm going with this?? The Kooks may be worth more power than you think on an SC car... you're just not seeing that extra 10 hp or so because of the drop in boost.
Check out "Mods for 4V Mods" in this last month's MM&FF for more on this subject.
Constable
North East Marauder Member
Billy - you had your Kooks on the car PRIOR to SCing it. Your thought process is not scientific. If you had the car SCed and THEN installed the Kooks & exhaust, there'd be a slight difference. Plus, accurate measurements cannot be taken from the boost gauge. I'm talking about electronic measurements.
Again: the differences in pressure I'm talking about are very slight. I'd like Lidio to chime in on this. I'd just like to see if he's experienced this or not... and I'd like to see what his thoughts are.
Again: the differences in pressure I'm talking about are very slight. I'd like Lidio to chime in on this. I'd just like to see if he's experienced this or not... and I'd like to see what his thoughts are.
BillyGman
New member
Until Lidio can chime in, since I've never had my car dyno tuned EVER,then I don't see why it would make any difference which modification I had first. What I'm telling you is if a boost lowering of any signifigance resulted from the Kooks, then I don't think that I'd be showing more than 9.5 PSI on the gauge, infact if ther were any changes on the gauge, then I'd think that it would read less than 9.5 PSI, and certainly not 10 PSI. would it? I wouldn't dispute your claim if you are talking about a mere .5 PSI of boost, but then again, I don't really think that .5 PSI of boost is going to matter one way or the other anyway. Do you? I DO understand what you mean abou the boost gauge cannot be considered exceptionally accurate. But I'd like to think that it's within .5 PSI of accuracy. But maybe I'm wrong on that.Constable said:
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