Camshaft, Adjustable gear, and Confusion

[smokin'740TIC]

Hey guys

This post is in addition to my post "Boost inquiry". I was under the impression by reading other posts that when I installed the ipd Turbo Cam and ipd adjustable gear I would be able to run my usual boost (Which for me is 13psi) and maybe even a couple more psi (for me I would only go to 15psi tops only if my car runs well under the 13psi with the new Cam and Gear). If I kept 13psi I thought, from reading, that the pull would be a lot better at the top end, it would pull much much better at high revs. I would use the gear to find an advance degree that would give me fair low end torque and still give me that great pull and high end torque that I have read about. And I have read about how when people get the camshaft and gear that the difference is amazing, like a totally different car. Now, if I run 13psi I should have enough fuel, right? I mean I have read that you do the camshaft and gear before bigger injectors and a new fuel managment system and/or a fuel pump regulator. Is this right? If not how do I get enough fuel for the camshaft and gear. And last question where do I get valve springs for double valve springs, and how much are they? Thanks guys. I owe y'all. I am learning a whole bunch about cars that I never knew. Thanks again guys.


Smokin'740 TIC

2.5" cat-back exhaust, MBC set at 13psi, Boost gauge, hacked air box, and 4" dryer hose Ram-air from 4" screen covered cut out on bumper to 4" hole in front of air box (Massive air coming in from the out side into the hacked air box)

[Magnum TE]

through the cam in and see if you need more fuel... there is no way to know untill you try it on your setup.

[davidmacq]

You may well have to turn down the boost a bit. I think the cam improves topend by increasing lift exhaust, etc to create more flow, so if your putting out more hp at higher rpm you need more fuel, just have to see what you can get though.

[MikeHardy]

it's true the HP rating off your fuel system should stay the same regardless of if it's done by cam or by boost. just that doing it by cam is less stressfull on the engine.

using the adjustible cam gear will affect your top end power moving the power band up or down the rev range depending on how much you retard or advance the cam. does anyone know if the IPD turbo cam likes being changed like that (like dale said the B cam doesn't so who knows about his one).

i tried advancing the stock A cam 6 degees on my old 740 turbo which made it very great down low, kept spinning the wheels off idle but it fell off at 5k where as stock it pulled till redline. but it was nice set to 2 degree advance giving 1500-5500 area of good power and it went very good (well nuts) around 2500-3500

[smokin'740TIC]

Hey guys

I know that the ipd VX cam works great with the adjustable gear, and that if set right it pulls good at low revs and great at high revs. However, it is not made for turbos, it was made for n/a volvos. At least that is what I read on their web site, which said that they did not know the affects of this cam on turbo volvos. But they have made a turbo specific cam since I last check last November before I got sick (A ruptured disc, and degenerative back disease, which I am currently fighting the pain with a lot of narcotics). So, since the ipd Turbo cam is made for turbo volvos, I assumed that the cam would work well with the gear so I can get fair low end torque and great high end torque that would give me that bitchin' pull I have read about. Is the ipd Turbo cam with gear better for my 1990 740TIC than the VX cam with gear or would the VX cam and gear be better? Thanks guys for helping me out. I did my first mod last Christmas (MBC with Autometer boost guage) with my dad as a little present and as way to cheer me up since i have been so sick and in a lot of pain. So, I am now very addicted to boost, so I am trying to up that great feeling with more mods. Thanks a lot guys. Talk to y'all later.

Smokin'740 TIC

2.5" cat-back exhaust, MBC set at 13psi, Boost gauge, hacked air box, and 4" dryer hose Ram-air from 4" screen covered cut out on bumper to 4" hole in front of air box (Massive air coming in from the out side into the hacked air box). My 740 Turbo Intercooler Volvo is a 1990 version with the mitsu. Turbo.

[n xntrx volvo]

stolen from a earlier thread
I did quite a bit of testing before we brought out the Turbo Cam. I tested the K cam, H cam, A cam, B cam, VX cam, and of course the T cam. The K, H and A cams were all pretty high end cams, horrible low end power. For the street, they are not much fun at all. The B cam was a little better, but really lopy at idle, and mostly high end only. The VX does loose a bit of low end, has great mid range, and decent top end power. The Turbo cam also looses a bit of low end compared to the T, but the mid range is great, and top end is on par with the K cam. I have found, at least on the B21FT, that advancing a few degrees works really well to give a bit more low end power, without a real noticable loss of top end. I passed through DEQ (emissions) Testing the very first time with the Turbo cam, not a single problem. VX cam took me 3 times to get through. I had a hard time getting through with A, B and H cams. As far as overlap is concerned, the idea of 0 overlap is to get really low emissions, because you are not blowing any air/fuel out the exhaust valve when boosting. With the Turbo cam, the extra overlap actually helps the turbo spool up a hair quicker, and hasn't negatively effected emissions. As far as mileage, I would not be the person to ask about that, as I am running lots o' boost, and an extra fuel injector, so I go through some fuel! :-P

So, from my experience, if you are driving your turbo car as a daily driver, and do NOT spend MOST of your time on the freeway above 5000 rpm, then the Turbo cam is the best choice, especially for the money. If you are cruising the freeways most of your time, and love wrapping out the tach, then you might look at the K or H cams, they are quite fun.

my $.023

Eric

[MikeHardy]

it's strange you had such probs with the A and V. in my B230ET they had good power from 2000 through to 6000RPM which i consider really cool, also no lopeyness to the idle at all.

[n xntrx volvo]

any ideas on where to set a 16v? for ft, ryan lists reducing overlap, but doesn't list settings. any thoughts on a dohc?

[smokin'740TIC]

Hey guys

Thanks for the replies, especially n xntrx volvo. I drive mostly in the mid range, about 2,000 to 4,500 (If I can get away with it I am up 4,000 to 4.500 a lot, good pull). However, I do love to let it boost and pull throughout the power band when I can, when traffic allows me to. So the Turbo Cam and gear would probaly be best for me. But just one question, I know on my stock cam I can really feel the g's up to somewhere in between 4,500 and 5,000 rpm. Will the ipd Turbo Cam (with the gear of course to still get the fair low end torque) make that great addicting pull of the g's at the high end (Like from 4,000 to 5,500 or more)? Will I be able to feel those G's throughout the power band as I increase the revs, mainly will it pull from mid range all the way through the top end where the rev limitter is set? Thanks guys for the replies. I am getting a lot of great information. Talk to y'all later.

Smokin'740 TIC

2.5" cat-back exhaust, MBC set at 13psi, Boost gauge, hacked air box, and 4" dryer hose Ram-air from 4" screen covered cut out on bumper to 4" hole in front of air box (Massive air coming in from the out side into the hacked air box). My 740 Turbo Intercooler Volvo is a 1990 version with the mitsu. Turbo.

[Canuckvolvo]

Keep in mind that the tests xntrx was referring to were on a B21FT powered car which will behave quite differently than your engine. Not to mention that just about every motor is different (different miles and modifications) And none of the tests were objective, more just 'seat-of-the-pants'. Heck, probably the biggest difference can be if you have an automatic or manual transmission.

So what I'm saying is, opinions are helpful, but in the end it's going to be up to you and YOUR 'butt-dyno'. The IPD cam sounds like a very good unit, and you may not even need the cam gear. I say buy the cam, and try it out for a while. If you really feel you need more low end grunt, buy an adjustable gear (I'll recommend Dales/245GTi here, plug plug) and advance the cam 2 or 4 degrees.