bamf3000

Right now I have an AFI ramhorn manifold and was thinking about switching it out for an Inlinepro.

Main reason being that I am keeping AC and a ramhorn takes up a lot alot of room and makes it extremely hard to fit and work on everything in the bay with the AC. No, the AC being taken out is not an option.

Anyways I was wondering how much power, if any, would be lost by switching from a ramhorn to an inline pro manifold? Of course running at the same psi.

Anyone that has switched one way or the other please reply

Thanks!

spoonhatchblack

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boostedcivicsir

i remember a certain red hatch and a certain red crx putting down fast times with an Inline pro manifold.

you will probably see different spool characteristics.

bamf3000

I have searched. If you have some threads that actually compare the 2 as far as performance and HP wise please post the link, cause I didn't find too many that answered my exact question.

And I know that you can make plenty of power on the inline pro, not worried about that. I'm wondering if anyone has changed from one to the other and how much power they lost up top, if any.

Pompiuses

I did som research about this a while back ago as I was wondering the same thing.

Even though the Inline Pro SS manifold's the best log manifold out there, it easily gets outperformed by a ramhorn manifold if all other things are equal.

Compare i.e. these two:
http://forums.evans-tuning.com...=2711
http://forums.evans-tuning.com...=3615

Nearly identical setups except for the manifold ; Same turbo, same boost, same exhaust, same motor, same tuner, same dyno.

As you see the Full-Race ramhorn easily outperforms it from 4000rpm and up. The differences would be even greater up top if a bigger turbo were used as the small GT28RS chockes up top. There's no differences in spool either.

That beeing said, there's nothing keeping you from making good power with the Inline Pro manifold either. It'll just take more boost to achieve the same power than with a ramhorn manifold.

boosted hybrid

There is about a 20-30whp difference in power potential between the manifolds. The inline pro holds boost so well, you can put a 3psi wastegate spring in a tial 44mm gate with a 35r and hold 3psi till 9-10k. I have been using the Inline pro manifolds alot at the shop (the t3/t4 stainless race version) on various builds, and my personal car. For the money, fitment, zero boost creep and less space constraint they are an awesome manifold. We even ran one on our SFWD CRX last season and made great power with it (trap speeds in the 155-160mph), quick pic:



On twin scroll turbos like the gt40r/gt42r there is about a 400-500rpm spool difference with the Inline pro manifold compared to a twin scroll equal length.

Pompiuses

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted hybrid &raquo;</TD></TR><TR><TD CLASS="quote">There is about a 20-30whp difference in power potential between the manifolds.</TD></TR></TABLE>

Wouldn't that depend on the setup? I'd imagine the difference would be bigger the more power you've got? As long as everything else is equal but the manifolds.

The GT28RS dynos I linked to above showed a 46 ft/lbs difference in midrange torque. That's a lot for a low boost setup.

bamf3000

I have a feeling that loss in midrange tq is b/c of the Edelbrock IM on the gsr with the Inline pro manifold more than anything. I highly doubt that IM is helping his setup too much with that low of boost and revving to only 8400.

I was able to hit 400 whp on 14lbs already with the Ramhorn. I'm guessing I could do the same with the Inline pro on about 15-16 lbs. Might be time for a switch, because I do like the fitment and ease of working on.

Thanks for responding Jeff.

Schister66

You'll more than likely see a gain in the midrange and a bit of a loss up top just due to the flow characteristics of the manifold. If fitment is your main concern, you can add a few psi to compensate for the loss of overall peak power.

boosted hybrid

Our trap speeds on our drag crx were inline with everyone else that was running last year with the gt42r around the same boost levels (38-42psi). If the power difference between the manifolds was significant, it would have reflected in the trap speeds. The torque difference between those two setups you listed was due to the intake manifold. There is a 20-30 ft-lbs difference between a car using the skunk2/itr intake manifold and a edelbrock intake manifold. I have had other cars running large turbos (gt35r, t4/t67) with the inline pro manifolds and compared to an equal length there is about a 20-30whp difference at most at the same boost level. The Inline manifold works really really well.

ghostofnyc

iTrader: (3)

inline pro is old school but works