Stock Motor 1 3/4" Vs. 1 7/8 Engine Dyno Results!!
08-16-2010, 01:31 AM
#41
Huh? I would like to see the test on an actual car then, and see a full dyno chart from idle up-to max RPMs -- with stock, 1 3/4 & 1 7/8 -- then we can have a full picture... The assumption should be identical brand & merge collectors on the headers as well.
Also, what did the Kooks show that you also tested?
It is also interesting to note that SLP makes only a 1 3/4 for the F-Body...
Also, what did the Kooks show that you also tested?
It is also interesting to note that SLP makes only a 1 3/4 for the F-Body...
Keep up the good work 
F@ck me 
06-23-2011, 05:53 PM
#48
TECH Senior Member
...
To my suprise the 1 7/8" headers made a considerable amount more power than the 1 3/4" headers! Power output was virtually identical untiL 4800 rpm when the 1 7/8" headers began to outpower the smaller 1 3/4" primaries. The 1 7/8" headers made a peak hp of 414.x hp & 421lb ft while the 1 3/4" headers made 408hp & 419 lb ft of torque. While this isn't a huge difference, it definately shows that even on a basically stock car the larger headers are still a good investment! Power under the 4800rpm point was virtually identical! Infact the 3000 rpm numbers were 209hp 366 tq from the 1 3/4" headers & 209hp 359.9 tq!
...
To my suprise the 1 7/8" headers made a considerable amount more power than the 1 3/4" headers! Power output was virtually identical untiL 4800 rpm when the 1 7/8" headers began to outpower the smaller 1 3/4" primaries. The 1 7/8" headers made a peak hp of 414.x hp & 421lb ft while the 1 3/4" headers made 408hp & 419 lb ft of torque. While this isn't a huge difference, it definately shows that even on a basically stock car the larger headers are still a good investment! Power under the 4800rpm point was virtually identical! Infact the 3000 rpm numbers were 209hp 366 tq from the 1 3/4" headers & 209hp 359.9 tq!
...
1 7/8 headers made +6 hp at hp peak and +3 ftlb at tq peak, and this is "considerabe"
1 7/8 headers made +0 hp and -6 ftlb at 3000 rpm, and this is "virtually identical"
Did I comprehend correctly...?
06-23-2011, 06:04 PM
#50
This thread is Patrick Swayze
1. Osama Bin Laden
2. Rod Blagoievich's political career
3. Weiner's political career
4. Anna Nicole Smith
5. Ted Kennedy
6. Jack Kevorkian
7. Randy Savage
The thread is DEAD!! Just get whatever you'd like. The real go getters are getting the 1 7/8's. If you want the no more than 15 ft lbs down low then get the 1 3/4 headers and just let this thread go to the cyber abyss.
1. Osama Bin Laden
2. Rod Blagoievich's political career
3. Weiner's political career
4. Anna Nicole Smith
5. Ted Kennedy
6. Jack Kevorkian
7. Randy Savage
The thread is DEAD!! Just get whatever you'd like. The real go getters are getting the 1 7/8's. If you want the no more than 15 ft lbs down low then get the 1 3/4 headers and just let this thread go to the cyber abyss.
06-24-2011, 11:11 AM
#51
This test was more to debunk the internet myth that 1 7/8 headers give up a ton of low end power to 1 3/4 headers. While you may not think that +6hp and +3ft/lb is considerable, in our opinion it is when the only difference in the test is the primary size. Obviously you won't pick up much but the fact that there is almost no low end power loss on a stock motor is whats important here. So for the people that are worried about losing low end power by starting their modification process with an 1 7/8 header now don't have to worry about that.
12-12-2011, 03:20 PM
#53
The thread's ALIVE!!!
The next step in to compare a 2" header primary VS the 1 7/8" primary to see if it again increases power without loosing much down low.
Nobody really ever talks about 2" primary headers... KOOKS makes them, they have 2" primaries all the way to the collector which is 3.5"
The next step in to compare a 2" header primary VS the 1 7/8" primary to see if it again increases power without loosing much down low.
Nobody really ever talks about 2" primary headers... KOOKS makes them, they have 2" primaries all the way to the collector which is 3.5"
12-12-2011, 05:27 PM
#55
Not true tainted, it can be done, I've seen it with the kooks, which are I think the only ones that offer that size. I got them but I already had the kmember. Hardest part is getting an oil cooler or placement of the knock sensors.
Can the gods kill this thread yet?
I meant mods.
Can the gods kill this thread yet?
I meant mods.
01-06-2012, 07:33 AM
#58
I almost pulled the trigger on 1 7/8s until I did my reserach now my 416 is running stepped headers 1 3/4 to 1 7/8s after I read up how much power they gained OVER a set of regular 1 7/8 headers however each car is different as well because of the changes to header design and length.
you need the velocity and going to big will slow things down causing the motor to have to PUSH the air out, stepped headers keep the velocity and then open up for size to help get the air moving out faster. This is why I went this route.
I know it may not make sense but I bet if you tested these headers on non stock motor you would even see more of a power loss down low. Reason being the Header exhaust ports are going to be no bigger therefore velocity is more important than size in that case, you will have more air comming out of the same size ehaust port getting pushed into a even bigger header where it will spread out and slow down even faster
you need the velocity and going to big will slow things down causing the motor to have to PUSH the air out, stepped headers keep the velocity and then open up for size to help get the air moving out faster. This is why I went this route.
I know it may not make sense but I bet if you tested these headers on non stock motor you would even see more of a power loss down low. Reason being the Header exhaust ports are going to be no bigger therefore velocity is more important than size in that case, you will have more air comming out of the same size ehaust port getting pushed into a even bigger header where it will spread out and slow down even faster
Last edited by 82cetuner; 01-06-2012 at 07:44 AM.
01-06-2012, 08:07 AM
#59
people need to realize that trying to replicate dyno results back to back to back are near impossible. after operating a few different dynos with multiple engine combos/makes/models etc, i dont put much merit in any difference in HP below 7-8 hp.
01-06-2012, 08:08 AM
#60
Not true tainted, it can be done, I've seen it with the kooks, which are I think the only ones that offer that size. I got them but I already had the kmember. Hardest part is getting an oil cooler or placement of the knock sensors.
Can the gods kill this thread yet?
I meant mods.
Can the gods kill this thread yet?
I meant mods.
