View Poll Results: do it
Do it, it's fun
31
72.09%
Do it but I don't think it'll be accurate
1
2.33%
Don't do it, it is a waste of your time
3
6.98%
Save your time and drink
4
9.30%
Just drive it
4
9.30%
Voters: 43. You may not vote on this poll
Trying to plan a crossfire experiment
Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 6,940
Likes: 1,490
From: New Jersey
Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 6,940
Likes: 1,490
From: New Jersey
I'm going to try and set up a dyno appointment this week. I was out driving the car last night and just rolling into the throttle was starting to put it sideways. Air temps were around 50 degrees so the tires weren't griping 100% but its never done that. My logs show less than 2/3 throttle and less than half even. She was in rare form last night and running mint.
I am getting knock counts on free revs but I think that's normal... it is pulling spark when that happens but I'm not getting any counts or retard while driving. The plan remains the same. Drive the car with the same tune and see if it leans out anywhere. That then means that it improved and is making more power because of increased fuel demand. I'm excited.
I am getting knock counts on free revs but I think that's normal... it is pulling spark when that happens but I'm not getting any counts or retard while driving. The plan remains the same. Drive the car with the same tune and see if it leans out anywhere. That then means that it improved and is making more power because of increased fuel demand. I'm excited.
Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 6,940
Likes: 1,490
From: New Jersey
Drifting
Joined: Jun 2018
Posts: 1,402
Likes: 287
From: Brisbane Australia
C4 of Year Finalist (performance mods) 2019
I'm going to try and set up a dyno appointment this week. I was out driving the car last night and just rolling into the throttle was starting to put it sideways. Air temps were around 50 degrees so the tires weren't griping 100% but its never done that. My logs show less than 2/3 throttle and less than half even. She was in rare form last night and running mint.
I am getting knock counts on free revs but I think that's normal... it is pulling spark when that happens but I'm not getting any counts or retard while driving. The plan remains the same. Drive the car with the same tune and see if it leans out anywhere. That then means that it improved and is making more power because of increased fuel demand. I'm excited.
I am getting knock counts on free revs but I think that's normal... it is pulling spark when that happens but I'm not getting any counts or retard while driving. The plan remains the same. Drive the car with the same tune and see if it leans out anywhere. That then means that it improved and is making more power because of increased fuel demand. I'm excited.
Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 6,940
Likes: 1,490
From: New Jersey
What do you guys think? Epoxy the rear coolant ports shut on the intake since I can't use the stock block off plates on my new head? I feel it'll cool the cylinder heads better.
Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 6,940
Likes: 1,490
From: New Jersey
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Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 6,940
Likes: 1,490
From: New Jersey
I made some timing table changes last night. Tip in is crazy now and that wasn't even trying really lol. It is pouring today. I'm hoping dyno by the end of the week. Then swap the intake over the weekend and get back on asap... before they brine the roads to hell. (If I can avoid it, I do)
Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 6,940
Likes: 1,490
From: New Jersey
With the present weather conditions I would normally be jumping at the opportunity to do some test hits. However, the car is still in pieces (see my other threads) and my cooling fan is still not installed. That being said, I secured a set of throttle bodies for free and I'm either going to have them bored or find a boring bar and do it myself. Thoughts?
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
I did mine, myself on a boring bar. The came out pretty good. After I bored 'em, I used a die grinder to smooth the transition from the original inlet radius, to the new bore diameter, then finished that off, with a hone. Came out sweet.
I "holed" my bore walls, b/c I went to the "max size you can go w/o holing", 2.03"/53mm IIRC. I holed. Fixed that with epoxy and smoothed by hand w/sand paper. Worked great for years.
I "holed" my bore walls, b/c I went to the "max size you can go w/o holing", 2.03"/53mm IIRC. I holed. Fixed that with epoxy and smoothed by hand w/sand paper. Worked great for years.
Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 6,940
Likes: 1,490
From: New Jersey
I did mine, myself on a boring bar. The came out pretty good. After I bored 'em, I used a die grinder to smooth the transition from the original inlet radius, to the new bore diameter, then finished that off, with a hone. Came out sweet.
I "holed" my bore walls, b/c I went to the "max size you can go w/o holing", 2.03"/53mm IIRC. I holed. Fixed that with epoxy and smoothed by hand w/sand paper. Worked great for years.
I "holed" my bore walls, b/c I went to the "max size you can go w/o holing", 2.03"/53mm IIRC. I holed. Fixed that with epoxy and smoothed by hand w/sand paper. Worked great for years.
I did some quick and dirty calcs based on some available CFM numbers in plenum per square inch and at 2 inches the throttle bodies should flow roughly 650 cfm according to my math. More than adequate for a street 350 and way more than what I feel the ported intake is going to flow. I don't recall what the stock size is but I based it at 46mm... think that is correct. And come up with 550 or so... so derate that slightly because it's wet flow and I'd feel you're looking at 500cfm or so stock and 600 or so at 2 inches. Seems about right. I don't have a plenum vacuum issue at wide open now. But part of that is more than likely that the choke point is the runners not the throttle bodies.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Yeah, CFI-EFI bored his TB's on his stock (+ported intake and dual exhaust) combo, and gained absolutely nothing. Your combo has greater demands than his, but if you're not building plenum vacuum now, then you probably won't see any WOT gains from the bore-job. What you will see is a nice increase in throttle ratio; more perceived low end grunt per mm of throttle depression.
Thread Starter
Le Mans Master
Joined: Aug 2017
Posts: 6,940
Likes: 1,490
From: New Jersey
Yeah, CFI-EFI bored his TB's on his stock (+ported intake and dual exhaust) combo, and gained absolutely nothing. Your combo has greater demands than his, but if you're not building plenum vacuum now, then you probably won't see any WOT gains from the bore-job. What you will see is a nice increase in throttle ratio; more perceived low end grunt per mm of throttle depression.