Well AMS has done some more dyno testing on the manifold that my friend developed. The Forrester Racing Heads Cast Intake manifold has now been tested on a smaller turbo car. The test car was a 1G with a small 16G, hks 272/272 cams, and a 1G Mas.

The peak HP gain was only about 5 or 6 peak hp but the real gains come later in the RPMs as the stock manifold begins to choke off power, the FRH makes more power for longer. At one point, the FRH manifold is making more than 25more hp than a stock manifold. It also made more torque and the boost comes on slightly sooner.

Anyone who understands dyno graphs and horse power graphs will tell you it does not matter how much more peak hp is made, it is the toal area under the curve in usable RPMs that matters.

So what does this mean? By making more horse power through the entire power curve, you will see as much as 2 to 3mph (estimated) increase in your trap speeds over a stock manifold.

I was really surprised to find out that an aftermarket manifold would improve driveabilty on a 16G and make that much more power. Dale even told me he was not expecting to see that kind of result.

Questions about the manifold are in this thread. This is the dyno graph

impressive.
what is the going price of one of these manifolds?

I wanna say AMS has them listed at 565. I know other places are going to be distributing them soon but I think AMS is the only location now that sells them.

Brandon

That's alot of $ for a manifold. The intake manifold is one of the most overlooked, underrated engine component IMHO. It's all in the plenum, coz even if youre running a bigger turbo, the intake manifold is your limiting factor given that you upgraded your pump and injectors. More air + more fuel = hp (although you have to factor exhaust there too coz you produce more).

Until tuners realize this, we are expected to pay top dollar for it. A Z06 intake manifold costs only $300.

565 is not that expensive for a manifold if you look at any others around. Most sheet metals will run you 800 to 1K dollars. One thing you will quickly realize is that tuning companies for imports rape import people because there are so many more cars on the domestic side of things. I could build up an 8 cylinder motor with forged parts for about the same price as my 4 cyilnder. You also need to consider Dale is a guy who fronted his own money and is not producing these in large quanities. The DSM mod market is relativly small compared to the vette/ mustang or fbody market. Exhaust systems for mustangs cost less than for dsms and there is 2 times as much material involved, go figure. It is a fact of life.

The only place I know of who forges the bottom end on vettes is Lingenfelter (I'm sure there are others). Nonetheless, they charge around $22k last I checked. Surely DSM parts aren't more than that!! Exhausts run about $800-1200, with $2000 for titanium systems.

The stock Z06 intake manifold goes for 450 bucks which is an upgrade for LS1s. So this is not bad priced at all. Anyways, I just wanted to let people know about the product and the gains shown on a small turbo car.

Those are some pretty impressive numbers! I also think it's priced pretty well compared to other manifolds. Thanks for the good info!

Any dyno runs with a larger turbo, say a 50 trim and up????

This curve shows the manifold is just as good as stock on a bigger turbo but absolutly takes off as the effiency of the stock manifold is reached and caused a bottle neck. This was done on Vernon Naidou's car. This is a T4 T61 but run only at 20psi to equate the airflow to a smaller turbo since most people do not run turbos that big. you can see how the stock manifold starts to drop off at about 6K (their rpm pickup was broken on the dyno so that mph coordinates to close to 6K rpm) and the FRH manifold keeps making power until they shut the car down. A top hp pull dyno was also done and they could only get about 504 hp out of the stock manifold but the forrester netted him 540 hp and they think the 1G throttle body was preventing it from making even more than that. DUring a dyno test done at AMS, a 60-1 was only able to make 500 hp on a stock manifold, but made just under 550 with a FRH manifold. So the gains are there to be had at all power levels.

Thanks for posting the dyno graph. I am a believer in intake manifolds and I would do this to my car in a heartbeat if onlt the $$ wasnt a little restrictive. For my purposes right now, the stock IM is good as your graph shows it is actually good to 114mph, adequate for quarter mile traps. The manifold has lots of potential and I wished you upped the boost more for comparison purposes. I would say the bigger plenum area would shine in higher boost pressure coz it can supply adequate air where the stock would lose breath and choke.

Chris,

You are making the common assumption on this dynograph when you see the mph. Just think about it as if you take the mph away and put in an rpm range and you will realize that you get these gains in every gear. 1st, 2nd, 3rd, and 4th gear will see huge gains in the upper rpms of each gear. This equates to putting down tons more power to the ground because the 30hp gain is put down in each gear and for longer periods of time. When you think of it in that perspective, it is kinda shocking isn't it.

This is the high horsepower pull in where AMS believes there is another restriction in the system. They were having a problem with their torque pickup that day too hence the messed up torque curve. I wish my car had this sort of dyno graph.

What was the boost on that? That's what im talking about

At around 70mph it starts to separate itself from the wimpy stock manifold. That's where you want your extra hp/tq.

Hmm. it strangely cuts off at around 550hp @ 95mph, looks like the engine bogged down. Keep us posted on what they found out on what caused it. It looks like a matter of tuning only and not a component bottleneck coz im sure all the supporting mods are done by the book.

That was the car that I was talking about the 1G throttle body being a restriction. They believe that is where it was missing out at. I do not remember the boost levels off the top of my head but it was either 30 or 35. The car has basically sat since this dyno pass. It has gone 10.4x so far.

Good product comes out with a extremely competitive price. A shop funds all the R&D and what they get. Pissing and moaning.
No wonder its so expressive to build our cars.
Thanks for the heads up on this product Kilurv8

Thanks Kitkat but I need to claify something. No shop funded the R&D. Dale Forrester put forth all the research and design money as well as designed the manifold himself. He put for the the casting money as well as the cash for the first run of manifolds. AMS worked out some dyno time with dale for a couple free manifolds as well as being the only distributor for a period of time. I just wanted to make sure credit goes to where credit is due.

And you are right, someone develops a product which is clearly better than a stock product and they knock. You jsut can't please some people. Kinda blows my mind.

Are these manifolds better than a Magnus sheet metal manifold? The Magnus manifold sells for $600.

What is the weight of the FRH manifold? Does it weigh more than the stock manifold?

http://forcedperformance.net/images/products/sm_intake.jpg

Dale has a magnus manifold and a BJs sheet metal that they will eventually do a back to back comparison with. I have heard people make complaints before but I have no personal experience. The Cast manifold weighs quite a bit more than the sheet metal but the FRH benefits far outweigh the negatives. Being cast they can be produced rather quickly and each one is an exact copy of previous ones. They can be drilled and tapped anywhere for anything (air intake sensors, vacume ports, map sensors). His manifold is reversable for rwd applications. but the big one is that the entrances into each runner are a radius entrance allowing smooth airflow into each runner (which is shaped like a velocity stack to begin with) where as a sheet metal has a hard 90degree bend causing vorticies and turbulance. When the results of the test are known, they will be reported.

the one other thing to take into mention here though is that all cars tested are using large cams. With the stock cams in place I seriously doubt you would see much of a gain if any in replacing the IM.

Larry, I bet you would be surprised on the gains you would get. You have to remember that although they were on a big cam, the gains seen were on the same cams. So although it might not be the 25hp gain you are seeing, my guess is you would still see a decent power gain in the top end. I dont know how much I can say about AMSs findings with their CAM test because they havn't released the figures yet, but the gains going from cam to cam were minimal compared to the amount seen in gains with the IM.

So bottom line is yes, your gains will not be as big as this but you should still see substantial gains.