Can you post your dyno sheets please. How much timing are you running with and without meth?
Any one have the remanufactured Cobra motor???
- Thread starter Banshee06
- Start date
As I said, the meth didn't add the power. It was the extra timing that the tuner was able to add in.
How much timing on and off meth?
600rwhp out of a KB is good power. Period.
Lol, pretty much. On 18psi. These #s are exactly where they should be. Every 2.8 KB I have ever installed with 17-18psi, would make roughly 575-600rwhp and 490-520rwtq.
The KB 2.8 and 2.6 is pretty lazy down low. Boost ramps up slightly instead of getting it all on the hit like a TVS or Whipple which attributes to the lower TQ #s.
IMO, there is nothing wrong with this car. If you are comparing #s to someone who makes 15-20rwtq or so more then you, there is nothing wrong. Every dyno is different. There are way to many factors that affect #s. Heck, how tight you strap the car on the dyno, type of tires and tire pressures all affect dyno #s amongst all the other obvious stuff.
If you REALLY feel like you have an issue with your reman engine, which I doubt there is. Do a compression check.....
If you want to make MORE power, then pulley the 2.8 the way it should be pullied for. If you do not want to run more boost. Sell the 2.8, put a 2.3 TVS on it and make the same HP and pick up around 75-100rwtq on the same amount of boost and have a fun car.
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- Mar 7, 2017
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Reman motor here for the last 6 years and 40,000 miles on it. Running strong.
The rwhp his particular car makes has zero comparison on your concern. There are guys that have gone 8s on the stock remanufactured longblocks.
It just seems like you are chasing a dyno #. With your lack of details and specific data, there is no other answer for you. The car is making power on par on where it should be.
Like I said and will repeat again. If you are concerned about the engine, do a compression test.
People with similar combos will make higher #s at times. There are way too many variables to say that if you run XXX combo, you will make XXX power on the dot. Just not going to happen....
Dave, do you think 490rwtq for 18lbs is still a bit low? The hp seems to be spot on for that boost. But then again, so many variables.
You guys have to realize, when you run these blowers, 2.8L and up, you need to spin them. 17, and lower, your wasting time. These blowers dont hit hard when under spun and you wont get those high tq numbers or that violent hit. Its been shown time and time again. I dont even remember how many twinscrews iv owned. I ran 19lbs on 93. Nothing lower. My 2.9 I bought bc I wanted to run 23 -25lbs on race gas. I didn't buy my 2.9 to be ran at 18lbs on pump. Get a 2.3 tvs. You will have a blast on pump gas and on race gas.
The best was when the 3.4 whipple came out, and few weeks later, someone posts up, can I run 15-17lbs with the 3.4 on pump gas and stock motor?? lol. sure you can. But dont get upset when a upper lower ported eaton cobra is right by your door making less hp. Your low boosted high peaking hp twinscrew numbers wont reflect that on the street. I have heard and seen some races when the 2.2 kb came out, on 15 17lbs vs ported eaton cobras and the outcome wasnt all that great. some owned forums, some are well known in the community, etc. I just wont say names. But my kb made 570rwhp! cool. its also on 15lbs of boost only.
You guys have to realize, when you run these blowers, 2.8L and up, you need to spin them. 17, and lower, your wasting time. These blowers dont hit hard when under spun and you wont get those high tq numbers or that violent hit. Its been shown time and time again. I dont even remember how many twinscrews iv owned. I ran 19lbs on 93. Nothing lower. My 2.9 I bought bc I wanted to run 23 -25lbs on race gas. I didn't buy my 2.9 to be ran at 18lbs on pump. Get a 2.3 tvs. You will have a blast on pump gas and on race gas.
The best was when the 3.4 whipple came out, and few weeks later, someone posts up, can I run 15-17lbs with the 3.4 on pump gas and stock motor?? lol. sure you can. But dont get upset when a upper lower ported eaton cobra is right by your door making less hp. Your low boosted high peaking hp twinscrew numbers wont reflect that on the street. I have heard and seen some races when the 2.2 kb came out, on 15 17lbs vs ported eaton cobras and the outcome wasnt all that great. some owned forums, some are well known in the community, etc. I just wont say names. But my kb made 570rwhp! cool. its also on 15lbs of boost only.
The cold hard sad truth is, yes, 490rwtq is correct. The short answer here is, it is completely normal for this combo to make that.
The longer answer......
I have installed hundreds of different combos. The KB 2.8 and KB 2.6 blowers have been the least impressive. They make HP, but the TQ and the "feel" on the initial hit is very very soft. Ported Eatons feel stronger. If I were choosing a blower for 600-700ish rwhp and this gets debated all day..... I am taking the 2.3 TVS, all day, every day. Why? Because it is just a more violent blower down low. It feels better and is more fun to drive. Does it make as much power as a 2.8 Mammoth on full tilt? No. But on pump gas with limitations, it makes more TQ, TQ faster and harder and makes the same amount of HP on 17-19psi and pump gas (not E85)
With that being said. All of the 2.8s I have ever installed at this type of boost made somewhere in the 490-510ish RWTQ range. It is what it is. Just because the blower is bigger, does not mean its better. People need to realize what they are buying..
Next, Banshee is claiming he is down 60rwhp. Well, come to find out, he is not. His comparison is being based off of what KB is stating it "should" make on that pulley combo. We all know KB. Heck they claim you can make 1000rwhp on stock rails. Can it be done? Yes, with perfect conditions and luck. But it is not recommended.
Next, going off Banshees assumptions, sorry man, I am not bashing you but just telling cold hard facts. He says hes running 18.5#s of boost. Based off of what though? KBs pulley chart? Or was this logged on the dyno? Going off the rest of this thread, there is a huge lack of critical data to help diagnose this issue if there is anything at all. We are all just guessing. People can assume all day. Some people say the #s are low, well that is because they are used to seeing glory #s on loose dynos put up big #s. It doesnt mean anything. Like I said over and over, there are too many variables to compare someone elses dyno that made 20rwtq more then someone across the country. Way too much can change that. We dont have all the data. We have general info here, no specifics on conditions, timing AF, actual logged boost etc etc.
All I know is, for 18psi on a 2.8 through cats on a stock engine, this is what you get.
Lets talk about what I mean about the KBs "laziness" in the 2.8 and 2.6. In this example, I feel its a perfect comparison. In the dyno chart below, we have a KB 2.6 and a Whipple 2.3 both pullied for 18psi.
The whipple hits 18 psi @ roughly 4,000 RPMS. The KB is 2 PSI behind it the whole way. The KB finally ramps up to 18 PSI @ 5700 RPMS. Where is the TQ? Well when the Whipple is making 20rwtq more, its also making about 2 PSI more at that point....... This is what I mean about its lazy TQ curve.
If we are comparing 2 KBs together, like I said, different dynos and different tuning techniques can swing a 20-30rwtq difference.
There is nothing wrong with this engine at all. If anything and this is a huge guess if there is anything wrong at all. Could be a belt slip issue since we do not see what boost is going other then being told it is 18.5#s. Not using a Snub idler is silly. KB likes to give claims like that, just like their BAP is all you need to make 800rwhp. No timing info. Possible cats causing a restriction. I have seen Kooks cats fall apart and clog before. Anything is possible. But with the lack of data I am standing by my statement. From what I have experienced with these blowers, the #s are right inline where it should be. There may be 20rwtq or so down low if timing is more agressive etc. But we dont have that info, how much meth is being put into it etc etc.
Meth injection (typically water/methanol mix) does not cool the intake air temps (IAT) at all in a PD (positive displacement) blower car. The only thing it does is bring the octane up so you can run more boost or timing. Just spraying water/meth without adding timing or boost will result in LOWER power numbers. I have tested this extensively.
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