New Cam question
Thread Starter
Intermediate
Joined: Nov 2005
Posts: 25
Likes: 0
From: Bowling Green Kentucky
New Cam question
Hi again all,
I am in the process of taking a 1984 Crossfire and changing it over to TPI, new heads, new cam, and a newer computer.
I have already purchased TPI, heads, and computer/w/harnesses.
Has anyone with a TPI car switched out heads and cam and how was your result? I just wanted some input on what you guys have experienced (My target is a 12second car). Any input on what cams you guys are running aftermarket is greatly appreciated.
thanks in advance,
Brian
I am in the process of taking a 1984 Crossfire and changing it over to TPI, new heads, new cam, and a newer computer.
I have already purchased TPI, heads, and computer/w/harnesses.
Has anyone with a TPI car switched out heads and cam and how was your result? I just wanted some input on what you guys have experienced (My target is a 12second car). Any input on what cams you guys are running aftermarket is greatly appreciated.
thanks in advance,
Brian
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
I don't think I have ever seen a 12 second car with a stock TPI on it.
The stock TPI will run out of revs at about 5100 RPM... there just isn't enough torque down there to make up for the lack of RPMs.
You will have to port the hell out of it. And don't forget to clean up the heads.
The stock TPI will run out of revs at about 5100 RPM... there just isn't enough torque down there to make up for the lack of RPMs.
You will have to port the hell out of it. And don't forget to clean up the heads.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
You are wasting a lot of time, money, and effort converting to a stock TPI. Although technically more advanced, the performance of the TPI isn't any better than that of the Crossfire. For a little more money, I've spent about $1200.00 so far, I could have a 12 second Crossfire.
RACE ON!!!
RACE ON!!!
Thread Starter
Intermediate
Joined: Nov 2005
Posts: 25
Likes: 0
From: Bowling Green Kentucky
Thanks everyone for your help again in advance and sorry about having to post the following paragraph 
(to EFI-CFI)
I am not asking your cranky opinion of my conversion. Just stating more facts to help with my question about a cam. If you do not have something about a cam you purchased EFI-CFI dont bother posting again here please. I know the way you work and try to get people all worked up. This time, no dice. Its simple... Your a waste of text..
now back to my post:
Thanks Bogus, the heads come back from the machine shop this Friday so they should be set. I will look into the Stock TPI and see what I can figure out.
(to EFI-CFI)
I am not asking your cranky opinion of my conversion. Just stating more facts to help with my question about a cam. If you do not have something about a cam you purchased EFI-CFI dont bother posting again here please. I know the way you work and try to get people all worked up. This time, no dice. Its simple... Your a waste of text..
now back to my post:
Thanks Bogus, the heads come back from the machine shop this Friday so they should be set. I will look into the Stock TPI and see what I can figure out.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Brian - you will have to port the hell out of the TPI... it is a pig.
CFI-EFI is right... the crossfire is capable of serious performance.
However, if you have your heart set on the TPI, go for it. Just be aware of the downsides.
CFI-EFI is right... the crossfire is capable of serious performance.
However, if you have your heart set on the TPI, go for it. Just be aware of the downsides.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
ok, before this spirals down into a pissing contest, let us just agree to disagree (I take my share of blame on this, but CFI was giving valid advice here).
Brian has every right to upgrade/convert to TPI. It's not how I would go, but it is a valid, and more cost effective route, compared with some of the thoughts I have (DFI or something of that nature).
As for cam, I am not well versed enough in them to help with selection.
It's just that the TPI is a torquey setup. As such, the cam you get had best to it's work down low, cause you don't want one that will come on at, oh, say 5500 rpm, because the TPI won't reach. Even ported, they run out at about 6000, tops. That number may even be a bit on the high side.
Check with www.tpis.com for some good options on cam choice.
The heads, are they stock iron or later aluminum or what? The 113s are the best, but 128s are pretty good. Either way, a good bit of careful porting will help a ton.
What year is the ECU? What injector do you intend to run? May I recommend the Ford Motorsport 24# (Blue Top) in a matched set. They are more expensive, but matched injectors are so very important with a batch style injection system.
Brian has every right to upgrade/convert to TPI. It's not how I would go, but it is a valid, and more cost effective route, compared with some of the thoughts I have (DFI or something of that nature).
As for cam, I am not well versed enough in them to help with selection.
It's just that the TPI is a torquey setup. As such, the cam you get had best to it's work down low, cause you don't want one that will come on at, oh, say 5500 rpm, because the TPI won't reach. Even ported, they run out at about 6000, tops. That number may even be a bit on the high side.
Check with www.tpis.com for some good options on cam choice.
The heads, are they stock iron or later aluminum or what? The 113s are the best, but 128s are pretty good. Either way, a good bit of careful porting will help a ton.
What year is the ECU? What injector do you intend to run? May I recommend the Ford Motorsport 24# (Blue Top) in a matched set. They are more expensive, but matched injectors are so very important with a batch style injection system.
Last edited by bogus; May 30, 2006 at 02:24 PM.
Burning Brakes
Joined: Nov 2003
Posts: 914
Likes: 1
From: Redding Ca
My stocker 1988 with TPI ran out of oomph at 4600 and ran mid/low 14's. My suggestion for cam would be to maximize the strength of the TPI which is low-mid range torque. If you are going for 12's, you simply MUST 60' well.
It seems to me someone on this CF is running high 12's with a 350TPI. Don't remember who. It might pay to find that engine description and see what he did. Maybe this is in FAQ's? A long time ago I printed out the exceptional engine combo's by Mojo and this one was in there. There was , like about a dozen examples in the print-out.
It seems to me someone on this CF is running high 12's with a 350TPI. Don't remember who. It might pay to find that engine description and see what he did. Maybe this is in FAQ's? A long time ago I printed out the exceptional engine combo's by Mojo and this one was in there. There was , like about a dozen examples in the print-out.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by BrianY(84-Crossfire)
(to EFI-CFI)
I am not asking your cranky opinion of my conversion. Just stating more facts to help with my question about a cam. If you do not have something about a cam you purchased EFI-CFI dont bother posting again here please. I know the way you work and try to get people all worked up. This time, no dice. Its simple... Your a waste of text..
I am not asking your cranky opinion of my conversion. Just stating more facts to help with my question about a cam. If you do not have something about a cam you purchased EFI-CFI dont bother posting again here please. I know the way you work and try to get people all worked up. This time, no dice. Its simple... Your a waste of text..
RACE ON!!!
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Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by bogus
Brian has every right to upgrade/convert to TPI. It's not how I would go, but it is a valid, and more cost effective route, compared with some of the thoughts I have (DFI or something of that nature).
RACE ON!!!
Burning Brakes
Joined: Nov 2005
Posts: 797
Likes: 0
From: Bedford Ma.
Not sure if this will help or not,not even sure if I should get involved here,but I think that I read that the cross fire system could be opened op to flow at about 1000 cfm.My only other suggestion would be,if you have your heart set on a TPI setup,to use one with short runners.
Thread Starter
Intermediate
Joined: Nov 2005
Posts: 25
Likes: 0
From: Bowling Green Kentucky
hahahaha, I knew that would get you rolling... nothing like a little bit of teasing for someone who likes to be provoked... thanks again CFI-EFI.
thanks for the other info guys (even you CFI-EFI). Now that I know how you work its awesome to poke at ya a bit. Kinda like the dog you have on a chain that you can tease occasionally. We know you know how to bite but its still fun to tease you. Thanks for the info on cost vs effectiveness. I will truely keep that in mind. However; it wont change the fact I am making the change and almost have all the parts together for it.
To all the other guys, thanks so much on the info. I will let ya know how the change over goes and I really appreciate the info CFI-EFI. You must work for the IRS hehehhehee ... always a pleasure to get ya involved...
Brian
thanks again CFI-EFI.thanks for the other info guys (even you CFI-EFI). Now that I know how you work its awesome to poke at ya a bit. Kinda like the dog you have on a chain that you can tease occasionally. We know you know how to bite but its still fun to tease you. Thanks for the info on cost vs effectiveness. I will truely keep that in mind. However; it wont change the fact I am making the change and almost have all the parts together for it.
To all the other guys, thanks so much on the info. I will let ya know how the change over goes and I really appreciate the info CFI-EFI. You must work for the IRS
hehehhehee ... always a pleasure to get ya involved...Brian
Last edited by BrianY(84-Crossfire); May 30, 2006 at 04:35 PM.
Pro
Joined: Jun 2004
Posts: 646
Likes: 0
From: Santee Ca
I just purchased a Lingenfelter LPE72411 roller cam to put into my '85 stroker. I have also purcahsed the Edelbrock Performer aluminum heads and are in the process of polishing them now. The cam cost me $269 and the retro-fit roller lifters were another $500. I am using dish pistons and will have about a 10.6:1 scr when I am done. Up from about 8:1 scr. Hopefully that will make it go a little better then before. I ported/polished/siamesed the intake/runners/plenum. On my 383 doing that was good for about 24 rwhp on my 383.
Here are a couple of pics
Here are a couple of pics