Who has ran Both- PD blower and a turbo? Not together
07-10-2017, 09:07 AM
#1
Who has ran Both- PD blower and a turbo? Not together
Wondering who has ran both setups to compare, I know Corey has (blackgmc) and I've talked with him.
Considering going with twins and just curious people's opinion. I know the topend will be great but I worry I am gonna miss the low end and snap of the blower. I am afraid a big single will be way to laggy for me. I need something that will support low 20's for boost and decent rpm. Just tossing around some ideas.
Considering going with twins and just curious people's opinion. I know the topend will be great but I worry I am gonna miss the low end and snap of the blower. I am afraid a big single will be way to laggy for me. I need something that will support low 20's for boost and decent rpm. Just tossing around some ideas.
07-10-2017, 01:30 PM
#4
I have, even on the same engine with just a different cam.
If your design point is 1000rwhp, well your only option is a turbo as none of the current roots/screw blowers will get you there (unless you have the BIG whipples).
The turbo is more time dependent to drive, meaning it reacts to other things than just throttle position, it depends how long you have a certain throttle position. In some ways this makes it easy to drive since the power comes on slower in normal driving situations. With a blower, you have to really command it to get going and do its thing. The blower is a little more effort to drive, but obviously lag is next to zero.
Turbo lag is really only an issue if you go from a dead stop with no brake boosting. Brake boost for 2-3 seconds on the turbo and you are the same as a blower. Highway driving there is almost no lag with a turbo if you downshift first before you nail it and let the engine rev.
A properly sized single will spool just as fast as smaller twins and be easier to set up as well.
The question is really what kind of driving do you want, in town snap or high speed highway runs?
If your design point is 1000rwhp, well your only option is a turbo as none of the current roots/screw blowers will get you there (unless you have the BIG whipples).
The turbo is more time dependent to drive, meaning it reacts to other things than just throttle position, it depends how long you have a certain throttle position. In some ways this makes it easy to drive since the power comes on slower in normal driving situations. With a blower, you have to really command it to get going and do its thing. The blower is a little more effort to drive, but obviously lag is next to zero.
Turbo lag is really only an issue if you go from a dead stop with no brake boosting. Brake boost for 2-3 seconds on the turbo and you are the same as a blower. Highway driving there is almost no lag with a turbo if you downshift first before you nail it and let the engine rev.
A properly sized single will spool just as fast as smaller twins and be easier to set up as well.
The question is really what kind of driving do you want, in town snap or high speed highway runs?
07-10-2017, 03:36 PM
#7
"Snap" is a word you'll need to lose from your vocabulary. Coming from a TVS there is nothing you could run that can touch its "snap", especially with a tight converter as you prefer. Knowing you even a looser converter would make the vehicle feel as though it has lost some snap. I'm right there with you.
I drive a 335 as a daily, a car that is praised for its lack of turbo lag, and believe me there is lag. The 4.8/369 requires more lead time than that, and once again its a "small turbo" combo.
You can build it to have quick spool, but not "snap" as you define it today. It's one of those things... I vote you pick a HP goal at a given RPM and pick a turbo that will reach that goal and nothing more.
I drive a 335 as a daily, a car that is praised for its lack of turbo lag, and believe me there is lag. The 4.8/369 requires more lead time than that, and once again its a "small turbo" combo.
You can build it to have quick spool, but not "snap" as you define it today. It's one of those things... I vote you pick a HP goal at a given RPM and pick a turbo that will reach that goal and nothing more.
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07-10-2017, 06:52 PM
#10
TECH Junkie
As above it will definitely hit slower but you can easily build boost in a couple seconds at the line without any attention. Converter wont flash as high but if you stay in it, it will push past the current rpm. My 3k converter would flash to 2800-3 and I could brake stall to 4400. If you're rolling 30-40 it will be pretty much instant then just hang on 