deleted_user_160
So as the title suggests, I'm having trouble choosing between cams. Namely 3. (Specs posted below as per respective manufacturer)
The price difference is considerable with one almost double the others. (Not being a tight ass)
$$$ do play a part though.
All the specs of the 3 Im looking at RSI stage 2, RSI stage 3, KG trimming KG2T + the one I currently have (ipd turbo)
Keeping in mind I have a tight squish 531 head, 35thou (Nicko can confirm this)
I may very well become interference with any cam beyond my spec. (If I'm not already) not really an issue, just can't be a tight ass and let a cam belt deteriorate.
So I'm chasing 300hp (wether I achieve it or not is another story) so the plan is a cam that has the room to get there, and some more, because let's face it, I'll get there and want more. As always.
In my mind and what I read, duration on exhaust is a very desirable trait for a turbo engine. So the 2T might be the one to grab.
Some advice on expected out comes. Would be great.
Ipd turbo cam (currently installed)
• Cam intake lift .466" (11.95mm) intake duration 256°
• Cam Exhaust lift .466" (11.95mm) exhaust duration 256°
• Overlap – 32°
Kg trimming kg2t
Lift: 10.5/11.9 (inlet/exhaust)
Lobe sepeation: 114 deg
Duration: 300 deg
Rsi s2
Intake Lift: 11.38mm Intake Duration: 238 degrees at .020" Exhaust Lift: 11.96mm Exhaust Duration: 270 degrees at .020" Lobe separation: 116 degrees
RSI s3
Camshaft Specs: Lift .490 - 12.44mm Total Duration: 392* .020 Duration: 288* .050 Duration: 240*
Lobe Separation: 114*
Philia_Bear
Both the RSI cams are still not available in stock AFAIK
the KG2t Cam is now $400 with echange and shipping
IMHO
Stick with the IPD turbo, 300WHP on it is a non issue
Spend the $300 on a better turbo instead of cam
deleted_user_160
Already have everything else, except injectors. I've been building everything slowly,
Slowbrick
I have a kg2t. I don't make 300hp and probably could have gone with an ipd turbo. The kg2t cost me a case of beer. It was an easy choice.
deleted_user_160
I'm chasing something more agressive. With more pull. As the ipd, seems too tame.
RSI are almost always out of stock. Small production runs, very well priced, and high demand will do that.
Is there another cam I could be looking at?
deleted_user_160
Well if a 2t cost me even 3 cases of been, it would be an easy choice as well. However that is far from the situation.
Philia_Bear
blondejay;36842 wroteI'm chasing something more agressive. With more pull. As the ipd, seems too tame.
RSI are almost always out of stock. Small production runs, very well priced, and high demand will do that.
Is there another cam I could be looking at?
Difference between IPD and KG2t is not all that big
KG2t pulls to 7200rpm while IPD is good to 6500
Unless your doing valve work to pull much past 6500, then the IPD cam retarded 2 degrees is going to be dam good
That said, 38mm EX valves + a little bit of head work and a proper turbo will net 300WHP without blinking
Vee_Que
A chinese rebuilt t3/4 hybrid is going on with a ported 90+ manifold. The bottleneck past the turbo install will be lh 2.2 I think.
deleted_user_160
Yes, that's the biggest constraint atm.
However if there are somethings I can put into motion that I'm not going to have to address at this point I would like to explore that properly.
The whole desire behind the 2t is that it has the duration, on the exhaust side that the others seem to lack.
Which I think will eliminate the need for valve work for quite a lot of time.
nickm
Yep tight squish 531 and B230ET pistons, so with a big cam...treat as an interference motor.
Yep the issue is going to be your fuel system.
egads
I recommend @CamZH :-P
Dauntless
I have the IPD Turbo, because it was cheap. It works well, but it behaves like a stock cam. I think I'll skip the KG2T and go for something larger.
nickm
Do you really need something that big with a turbo motor?
I was under the impression that a large overlap decreased the dynamic compression thus spool and low end.
Red blocks are not honda rev monsters. So I'd go for a conservative overlap and high lift
deleted_user_160
Kg also do the gt6 which is modeled off the group A cam not the group a t5 though.
They are all high rpm cams, something that's not really me. I like torque. (It's a wonder I haven't got an LS1 in yet)
So those are the 3 cams I'm choosing from. What can I expect from them?
deleted_user_160
Wouldnt longer exhaust duration be desirable? This (from what I read) is a good way to avoid going to over size valves.
I'm reading and learning more every day, this is why I asked here as some of you have far more experience than I.
And many have read the do's and donts of the past
nickm
I'm not sure .. I think you want exhaust gas velocity to get the turbo to spool quicker
deleted_user_160
Pressure v's quantity?
Dauntless
Aggressive cams designed for turbo engines don't necessarily have lots of overlap.
volvodriverman
I've got the kg2t in the gt with thelostartof chipped lh2.4 ign & fuel, cam is great & up to a lot more than the 16t can deliver. Fuel & ign side works well in this format although there's a big flat spot in ignition side & it overfuels. Dunno if thats helpful...
deleted_user_160
over lap is where both valves are open at the same time.
So given that the 2T has longer duration on the exhaust lobe, the cam is or has more over lap than the other two in the thread?
The other thing is that every description of the 2T cam is "its a true turbo cam"
Long duration exhaust sounds like a good thing on a turbo car?