LedfootLarry

How fast can you spin the tvs 2300 ? The guy who had a big build, Roger used a 2.7 " snout, overdrive crank and rear pulley`s. Now I am not going to run meth like he is but do you think he is spinning that thing up to around 24000 rpm`s ?
I am spinning mine to 20800 right now, I want more power.
I have a c5 z06 402 afr 245 10:1comp , 8" crank pulley , overdrive rear cogs, 3.3" snout.
I removed the Maggie Heat exchanger, added one with a fan placed under right headlight. have a 1 gallon coolant tank also.
13lbs boost 650/650 dyno
I shift at 7200 through the traps in 4th, to save a shift, but otherwise short shift at 6600. should I calculate blower speed at 6600 instead ?
8/3.3x1.2x6600=19200rpm`s

should I pulley down to a 3" ? 8/3x1.2x6600=21120 rpm`s

this year I am adding full 3" exhaust ,tpis 102 tb ,
want to add boost also, but not sure ??

realcanuk

I answered this in another forum where you posted but I will answer again.

As far as your questions, I think my eforce, being a 2300 is fairly comparable. My build is very very similar to yours. 402, 9.9 to 1 compression, ported 245 heads, overdrive damper, etc etc.
Edelbrock also says the maximum to spin the blower is 20000 rpm. With my current setup I am spinning it at 18000 and making about 12.5 lbs of boost. I just changed the pulley which will bring it to 20000, but haven't run it yet since its winter here.
The thing is, through an auto and stall, I am making considerably more power than you are. You mentioned your cam elsewhere and I think that must be what is hurting. I don't think spinning the blower a little faster will hurt anything, as lots of guys do it. The big question is will it add heat, and therefore be a trade off in power.
That I am really not sure of.

Also, a question for you. Could you tell me if the heat exchanger with the fan helped your IAT's and by how much and what conditions. I was thinking of doing something similar along with a better pump.

Thanks.

getburnt

Can you post info on your heat exchanger? From what I remember Roger's build was 9 or 9.5:1 comp . So you at least are a little better off power wise there.

My build is only on 6-8lbs on a stock ls3 with TSP heads and I am at 630whp 580wtq. That is on a GT11 cam that I am now changing out. I have 1:1 rears with the 3.4" front.

LedfootLarry

here is the cam card :

LedfootLarry

Guys,all I can tell you about the h/exchanger is my shop supplied it,not sure what make, and I have no way of monintoring iat , but , moving the magnuson
H/exchanger away from blocking airflow to the rad made a big difference in engine coolant temp. especialy with the a/c on.

realcanuk

17 degrees of overlap is far from ideal with a PD blower, although that really has nothing to do with your blower question.
I guess the answer to that is that although some do it, I guess they say 20k rpm max for a reason and its some risk to over spin it.

LedfootLarry

what rpm is your max ?

realcanuk

I generally shift at around 65-6600 rpm to try and save the 6L80. I stretch 4th gear to close to 7000 when at the track.

The blower rpm calculations I used are at 6800 rpm.

LedfootLarry

Are you using methanol injection ?

realcanuk

I am spraying 50/50 water/meth.

LedfootLarry

That contributes a lot of our power difference!
According to Arun , my cam is ok, he is doing an sd tune
in a month or so , last year someone else tuned it, i had cooling
Problems, only one fan running.
This year i added 3" exhaust and 102 mm tb
just not sure whether to turn up boost a little, but might stay conservative
I calculated my blower speed of 21000 @ 7200 rpm.
I guess I could calculate it at 6600 rpm, pulley down to
3" and have same blower speed.

old motorhead

Are the o/d cogs a different ratio than the non-cogged o/d pulleys? The non-cogs are 3.49/3=1.16.

LedfootLarry

36/30 tooth 1.2:1

old motorhead

Ha! I was wondering why the cogged drives were making a little more boost and hp after the swap. Should have known

_zebra

Larry,
i can't believe i missed this discussion. anyway, with the 3" exhaust, you'd lose a little boost (while moving the same amount of air). and here's the efficiency map of the 2300 for your RPM calculations

ace32x

running my 2300 (ls9 blower not the aftermarket tvs) at 23k atm. running a 2.35 upper and a 14% od lower.) reving to 7k atm but did some valve train mods and went to a bigger cam and am planning on spinning the motor to 7500 and seeing if the blower holds up.

old motorhead

I'm guessing you've done more than a little work on the intercooler bricks and the heat exchanger? Care to share on the other work done?

ace32x

Running the d3pe heat ex it they make for the zr1 (Stewart coolant pump, custom heat ex and reservoir tanks and cnc fittings into the IC bricks) and then some thin aluminum plating onto the bottom of the ic bricks to protect from heat. In a standing halfmile run my iat2 temps never go over 140 (even at 95 ambient)

LedfootLarry

I have spun mine to 7500, but that really causes too high IAT'S
I only have one brick. So I am going to start short shifting, 6000-6500
And probably pulley down . I am also putting a tigershark front on, removing the bumper foam, and putting as big as possible heat exchanger
In front.

ace32x

Front of mine