New Mod Made ***7mpg***
Member
Joined: Jan 2008
Posts: 283
From: Mililani, Hawaii
This is scary, the sensor cools down as air get sucked pass it. The greater rpm the greater the cooling and the more gas it supposed to tell the computer to send to the engine. Yes, gas milage might be better but lean is hot and harsh on the engine. Drill that hole get that sensor in that wind tunnel.
Member
Joined: May 2007
Posts: 306
From: Texarkana, TX
Member
Joined: Mar 2008
Posts: 1,659
From: Wisconsin
I say leave the IAT sensor out and buy a wideband to see what you are running for a AFR.... though i doubt it will happen seeing as you made your own intake as opposed to buying one and a wideband and sensor is around $350. Still would be nice to see the results.
I am pretty sure you would be leaning it out slightly (probably not enough to hurt anything in the short term).
....and just to clear up some other questions.. If you did lean it out .4-1.1 points you will probably be seeing an INCREASE in hp. Not a drop.
I am pretty sure you would be leaning it out slightly (probably not enough to hurt anything in the short term).
....and just to clear up some other questions.. If you did lean it out .4-1.1 points you will probably be seeing an INCREASE in hp. Not a drop.
My MPGs have been all over the place with my SRI installed. The only thing that really concerns me is that I have never gone below 33 MPG and I am now hitting 30 with almost zero WOT and 90% highway at 70MPH.
I went ahead and added another 90° bend to see if it would make a difference. So far I have noticed a change in sound and the throttle response seems a bit more reactive when I depress the gas pedal.
I went ahead and added another 90° bend to see if it would make a difference. So far I have noticed a change in sound and the throttle response seems a bit more reactive when I depress the gas pedal.
I say leave the IAT sensor out and buy a wideband to see what you are running for a AFR.... though i doubt it will happen seeing as you made your own intake as opposed to buying one and a wideband and sensor is around $350. Still would be nice to see the results.
I am pretty sure you would be leaning it out slightly (probably not enough to hurt anything in the short term).
....and just to clear up some other questions.. If you did lean it out .4-1.1 points you will probably be seeing an INCREASE in hp. Not a drop.
I am pretty sure you would be leaning it out slightly (probably not enough to hurt anything in the short term).
....and just to clear up some other questions.. If you did lean it out .4-1.1 points you will probably be seeing an INCREASE in hp. Not a drop.
Frequent FitFreak Poster
Joined: Mar 2007
Posts: 588
From: Lehigh Valley, PA
In general, statistics are treacherous ground. I tend to recall a study that claimed those who eat lobster regularly had a lower heart attack risk than those who didn't, which makes little sense because lobster is high in cholesterol. The cause of the lower risk was shown to be that those who can afford lobster on a consistent basis also have access to better medical care and various other benefits that are naturally linked to a high SES (socio-economic status.)
My point? There are often several factors that can vary any given outcome. In this particular case, perhaps driving style, or maybe the old air filter was dirty/clogged. Remember correlation =/= causation, neccesarily.
Last edited by storm88000; Mar 19, 2008 at 04:58 AM.
Member
Joined: Oct 2007
Posts: 388
From: Amish Paradise, PA
I agree with Jordan, I'd have to see multiple tanks before and after with the same driving style.
Many hypermilers put hot air intakes such as that on their car during winter for better fuel economy, but considering when the post was made, and the OPs location, that huge jump can also be attributed to warmer spring temps, and the shift back to a summer gas blend at the pumps as well.
Many hypermilers put hot air intakes such as that on their car during winter for better fuel economy, but considering when the post was made, and the OPs location, that huge jump can also be attributed to warmer spring temps, and the shift back to a summer gas blend at the pumps as well.
Amazingly enough, it was the same temps in Memphis and in Gulf Shores when we drove there. For the rest of the week it was 20 degrees COOLER at the beach than it was 400 miles north in Memphis. Some crazy weather.
Member
Joined: Mar 2008
Posts: 1,659
From: Wisconsin
Try living in Wisconsin.
Member
Joined: Feb 2008
Posts: 1,049
From: lake worth FL
Stock, I could not get over 35-36mpg even with an empty car on the highway. Around town, driving aggressively, I've gotten as low as 20mpg.
A few days ago I put on my home made $40 short ram.
I was on the road today for 8 hours heading down here to Gulf Shores from Memphis. At one point with some slowing and speeding (and a burst to 100mph to pass a couple trucks) but setting cruise at 75mph, I got 40.5 mpg with about 500lbs total baggage and people. AMAZING!! I never got over 36mpg before this.
Then after that, on a more stable portion about 150 miles long, set at 75mph, I got 43.8mpg!!!!!! I am shocked and amazed.
A few days ago I put on my home made $40 short ram.
I was on the road today for 8 hours heading down here to Gulf Shores from Memphis. At one point with some slowing and speeding (and a burst to 100mph to pass a couple trucks) but setting cruise at 75mph, I got 40.5 mpg with about 500lbs total baggage and people. AMAZING!! I never got over 36mpg before this.
Then after that, on a more stable portion about 150 miles long, set at 75mph, I got 43.8mpg!!!!!! I am shocked and amazed.
Would you mind listing a few fills woth of mpg before and after the change
Also a retraction of the 7mpg claim is OK for sure. I'd make the change right away if it was verified real with real data.
Member
Joined: Oct 2007
Posts: 314
From: Marysville, Oh
So it's been a month. IS it still true you saw a consistent +7mpg increase with this change?
Would you mind listing a few fills woth of mpg before and after the change
Also a retraction of the 7mpg claim is OK for sure. I'd make the change right away if it was verified real with real data.
Would you mind listing a few fills woth of mpg before and after the change
Also a retraction of the 7mpg claim is OK for sure. I'd make the change right away if it was verified real with real data.
It appears my wife is averaging about 25-27mpg here in town, she's been driving it more than I have since we've been back in town. But this is a definite improvement. Sometimes, it's hard to tell, because she fills up like $5-10 at a time. She doesn't fill all the way up. Arrrggg!
Member
Joined: Feb 2008
Posts: 1,049
From: lake worth FL
BTW I see you are in Lake Worth. Did you get your windows tinted yet? I want to and was looking for a place around here that has done Fit's and has a decent price. I see the film for sale pre cut on ebay cheap, but was thinking the $200 for a pro to do it would be worth it if the place has been around and looks like they will be for some time in case it fails and needs to be replaced for free.
back to the thread
IMHO
... in summary, it looks like the 7mpg was not something available to any of us unless you are willing to risk changing the Fuel Air ratio and you engine.
It's disappointing to see post that state big improvements that have not been fully proven before plastered on the form to be dis-proven. 
Last edited by pcs0snq; Apr 11, 2008 at 10:00 AM.
IMHO
... in summary, it looks like the 7mpg was not something available to any of us unless you are willing to risk changing the Fuel Air ratio and you engine. It's disappointing to see post that state big improvements that have not been fully proven before plastered on the form to be dis-proven.
... in summary, it looks like the 7mpg was not something available to any of us unless you are willing to risk changing the Fuel Air ratio and you engine.
It's disappointing to see post that state big improvements that have not been fully proven before plastered on the form to be dis-proven. I for a fact went from 36mpg to 43+mpg and the only change I made was the SRI.
Now as for the reason that happened, I would guess people have their own opinions on. But the fact remains I did improve my mileage and so far, the in-town mileage has improved as well.
Prior to that, on 6-7 trips between Memphis and Little Rock Ar, I averaged 35-36mpg no matter what the speed or amount of luggage.
I did not have an A/F meter installed, so I cannot provide A/F data.
As was stated though, I did check the spark plugs after the trip and did not see any signs of detonation or a severe lean condition.
Since coming back to Memphis, I installed the IAT in the OEM spot on the SRI. My wife has been driving it mostly since then and getting partial fillups, but I did fill/drive/fill on one occasion and saw a 26mpg in-city spirited session. Previous in-town driving had ranged from 19-24mpg at the most. I have not since been back out of town on the highway to re-test the highway mileage.
Last edited by Sid 6.7; Apr 11, 2008 at 10:38 AM.
Member
Joined: Feb 2008
Posts: 1,049
From: lake worth FL
On 4 fill-ups going down to Gulf Shores and coming back I got between 40-44mpg each and every time. That was averaging 73-76mph, 2 passengers and 300lbs of luggage.
Prior to that, on 6-7 trips between Memphis and Little Rock Ar, I averaged 35-36mpg no matter what the speed or amount of luggage.
Prior to that, on 6-7 trips between Memphis and Little Rock Ar, I averaged 35-36mpg no matter what the speed or amount of luggage.
Is the "7mpg improvement" from the Air filter and pipe as 1st stated or the lack of factory location on the IAT?
I think everyone would like to see a +7mpg improvement, but it's hard to still see what you did that made the gain and as you checked using totally different routs making it an unfair comparison.
How would you feel if a user read what you posted and made the change and hurt the engine with the IAT not factory or saw no gain at all?
I refer you to my earlier posts:
The IAT wire is very short (maybe 2"). It was never at any point "hanging somewhere by the manifold".
For the sake of argument, why is running a little leaner a bad thing? It's bad for a forced induction motor, right? Yeah. You want to run fat with a turbo, close to an 11-11.5:1 a/f. When I was tuning my AEM EMS on my 1991 Eagle Talon AWD, I was shooting for an 11.5:1 a/f on my AEM WB-O2. At 20psi on my GT30R and 20 degrees total advance, on 93 octane, I made 470whp. I would have made a few more horses with more timing, or leaning it out, but I would have reached the limit of my Precision 750hp intercooller and started knocking. So I played it safe.
But in an all motor setup, a lot of guys I've seen tune for 13-13.5:1 a/f. Running lean is not a horrible thing.
And regardless IF, IF the car was running a little leaner than before, this motor is a 1.5 liter, low compression, naturally aspirated motor making 85whp. Running 93 octane gas. I couldn't get knock if I hit it with a 10lb sledge!
And IF, IF I traded 5 whp, for 7 more mpg, WGAF? I'll trade 5whp on the highway for 7 more mpg anyday!
The sensor was reading air temps up near the top of the throttle body, under the hood. The SRI has a 90 degree bent tube with a total length of 6", sucking in UNDER-THE-HOOD AIR. I seriously doubt there was much of a difference in the temps at the IAT and the TB.
But, I mounted my IAT in the SRI today using a 5/8" hole saw bit and the factory rubber grommet, so we will now see if that helps/hurts.
For the sake of argument, why is running a little leaner a bad thing? It's bad for a forced induction motor, right? Yeah. You want to run fat with a turbo, close to an 11-11.5:1 a/f. When I was tuning my AEM EMS on my 1991 Eagle Talon AWD, I was shooting for an 11.5:1 a/f on my AEM WB-O2. At 20psi on my GT30R and 20 degrees total advance, on 93 octane, I made 470whp. I would have made a few more horses with more timing, or leaning it out, but I would have reached the limit of my Precision 750hp intercooller and started knocking. So I played it safe.
But in an all motor setup, a lot of guys I've seen tune for 13-13.5:1 a/f. Running lean is not a horrible thing.
And regardless IF, IF the car was running a little leaner than before, this motor is a 1.5 liter, low compression, naturally aspirated motor making 85whp. Running 93 octane gas. I couldn't get knock if I hit it with a 10lb sledge!
And IF, IF I traded 5 whp, for 7 more mpg, WGAF? I'll trade 5whp on the highway for 7 more mpg anyday!
The sensor was reading air temps up near the top of the throttle body, under the hood. The SRI has a 90 degree bent tube with a total length of 6", sucking in UNDER-THE-HOOD AIR. I seriously doubt there was much of a difference in the temps at the IAT and the TB.
But, I mounted my IAT in the SRI today using a 5/8" hole saw bit and the factory rubber grommet, so we will now see if that helps/hurts.
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WillrunifChased
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Dec 29, 2008 10:42 AM
