Would this combo pull to 5500rpm?

Gasket matched Pleneum, SLP Runners and Vortech Base

 

Define 'pull'

Off the bat guess? No. You'd probably be faster shifting earlier than that. It wont be dying off like a stock TPI at that RPM though, which will be helpful for the 1-2 transition if its an auto trans. It'll also be dependant on the heads, cam, and exhaust.

 

My "stock" tpi "Pulls" to 5,500

Ported/siamesed stock base will get you there or close.

 

tpi_roc
How the hell does your car pull to 5500? My auto shifts at 5000

 

Mine pulls to 6000 rpm's w/ported gasket matched SLP runners & 5500 w/stock runners.
BD3

 

How are you guys getting your stock tpi's to pull 5000-5500? I've had two, an 86 305 and now an 87 350. Both start dying off at about 4250.Has siamising the base netted you any gains in ET?

 

My stock tpi would rev pretty high after I put aftermarket ignition on it, but I doubt 5500. No reason to rev that high anyhow.

 

Mine's far from stock.Fully ported from the TB to the heads.
BD3

 

Mine will "pull" to 5500 RPM but it probably makes its peak power around 4750-5000 RPM. Why "pull" past your motors power band?

 

Because on the shift that puts you higher in RPM's and again closer to your peak power.


You always shift a little beyond your peak HP

 

same with mine, it will "pull" to 5500 ,but runs its best shifting @ around 5k.

 

If I use that combo it will be ran with vortech heads and full exhaust. Will Siamising the SLP Runners help because I don't want to cut into the manifold. Also anyone have a good cam for a set up like this.

305 TPI 5 spd

 

The combination that I have makes max power at 4800 RPM but it hangs in there power wise all the way to 5700 RPM. After the power peak at 4800 RPM the engine almost holds flat on the HP curve until I stopped testing at 5700 RPM. At 5700 RPM I was still holding 232 RWHP. The ZZ-4 cam that I use works very well with my 305.

 

What if I siamise the intake from top to bottom leaving only like
3-4" of runner in the vortech manifold? Also can you even siamise the vortech manifold?

 

Mine pulls 6k without a hitch already with minor mods. Makes strong right to 6k then falls absolutely flat which is ok seeing as (IMO) you pretty much need roller rockers and hardened push rods after that. I have:

- cold air to the fender well
- pullies
- ported plenum
- Jacobs Ultra Team

The car is a '91 Formula with LB9, N10, stick, etc. The SLP runners and Vortec base (Scoggins-Dickey ?) will mean vortec heads and that combo with the right exhaust would make REAL power beyond 6k -- IMO.

thx,
RP.

 

Here is the answer to the question about siamesing for gains in RPMs. Mike Davis tested his LTR setup and made peak HP at 5600 RPMs. He used an Edelbrock base to start with, the link below shows a pic of the siamesed intake as well as his dyno testing and times at the track.

http://www.mycar.net/mafb/registry/detail.cfm?id=201

 

Mine pulls WELL past 6 grand. And I love every second of it!

 

my 85 305 tpi pulls through 6500 and will scare the hell out of you if you hold it that long, when the shift kit kicks in you better pray theres no traffic!! 'a 70 MPH 1-2 is a bitch!!!'

 

Mine pulls to 5500